Merge branch 'feature/candidate_payments' into homo_experimental

feat(payments): rename match reason from 'exact_amount_different_dni' to 'exact_amount_near_dni'
feat(payments): filter candidates by DNI distance
2026-08-27 16:52:08 -03:00 · 2026-08-27 16:40:32 -03:00 · 2026-08-27 16:04:12 -03:00 · 2026-08-27 15:38:24 -03:00 · 2026-08-27 15:21:28 -03:00 · 2026-08-27 15:21:16 -03:00
62 changed files with 2876 additions and 804 deletions
--- a/.env.example
+++ b/.env.example
@@ -8,6 +8,7 @@ PURCHASE_CHECKOUT_EXPIRATION_MINUTES=30
 PURCHASE_QR_EXPIRATION_MINUTES=15
 PURCHASE_TELEPAGOS_EXPIRATION_MINUTES=30
 PURCHASE_TRANSFER_EXPIRATION_MINUTES=1440
+PURCHASE_TRANSFER_CANDIDATE_AMOUNT_TOLERANCE_PERCENTAGE=5
 STOCK_RESERVATION_EXPIRATION_MINUTES=30
 FRONTEND_URLS=http://localhost:4200

@@ -31,6 +32,7 @@ AUTH_LOGIN_ATTEMPT_WINDOW_MINUTES=30
 AUTH_LOGIN_LOCK_MINUTES=15
 AUTH_LOGIN_RATE_LIMIT_PER_MINUTE=10
 AUTH_LOGIN_IP_RATE_LIMIT_PER_MINUTE=30
+AUTH_PASSWORD_RESET_EXPIRATION_MINUTES=60

 LOG_CHANNEL=daily
 LOG_STACK=single
--- a/app/Domains/Auth/Controllers/ValidateResetPasswordAttemptController.php
+++ b/app/Domains/Auth/Controllers/ValidateResetPasswordAttemptController.php
@@ -22,10 +22,18 @@ class ValidateResetPasswordAttemptController extends Controller
    {
        $data = $request->validated();

-        if (! $this->resetPasswordAttemptService->validateCode(
+        $result = $this->resetPasswordAttemptService->validateCode(
            $data['email'],
            $data['codigo'],
-        )) {
+        );
+
+        if ($result === ResetPasswordAttemptService::CODE_EXPIRED) {
+            throw ValidationException::withMessages([
+                'codigo' => __('api.auth.reset_code_expired'),
+            ]);
+        }
+
+        if ($result !== ResetPasswordAttemptService::CODE_VALID) {
            throw ValidationException::withMessages([
                'codigo' => __('api.auth.reset_code_invalid'),
            ]);
--- a/app/Domains/Auth/Models/ResetPasswordAttempt.php
+++ b/app/Domains/Auth/Models/ResetPasswordAttempt.php
@@ -7,7 +7,7 @@ use Illuminate\Database\Eloquent\Attributes\Hidden;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;

-#[Fillable(['user_id', 'codigo', 'reason', 'status'])]
+#[Fillable(['user_id', 'codigo', 'reason', 'status', 'expires_at'])]
 #[Hidden(['codigo'])]
 class ResetPasswordAttempt extends Model
 {
@@ -31,6 +31,7 @@ class ResetPasswordAttempt extends Model
    {
        return [
            'user_id' => 'integer',
+            'expires_at' => 'datetime',
        ];
    }

--- a/app/Domains/Auth/Services/ResetPasswordAttemptService.php
+++ b/app/Domains/Auth/Services/ResetPasswordAttemptService.php
@@ -12,6 +12,12 @@ use Throwable;

 class ResetPasswordAttemptService
 {
+    public const CODE_VALID = 'valid';
+
+    public const CODE_INVALID = 'invalid';
+
+    public const CODE_EXPIRED = 'expired';
+
    public function createForEmail(
        string $email,
        string $tenantCode,
@@ -146,12 +152,12 @@ class ResetPasswordAttemptService
        );
    }

-    public function validateCode(string $email, string $code): bool
+    public function validateCode(string $email, string $code): string
    {
        $emailFingerprint = $this->emailFingerprint($email);

        try {
-            return DB::transaction(function () use ($email, $code, $emailFingerprint): bool {
+            return DB::transaction(function () use ($email, $code, $emailFingerprint): string {
                $user = User::query()
                    ->where('email', $email)
                    ->lockForUpdate()
@@ -169,14 +175,27 @@ class ResetPasswordAttemptService
                        'email_fingerprint' => $emailFingerprint,
                    ]);

-                    return false;
+                    return self::CODE_INVALID;
+                }
+
+                if ($attempt->expires_at?->isPast()) {
+                    $attempt->update([
+                        'status' => ResetPasswordAttempt::STATUS_EXPIRED,
+                    ]);
+
+                    Log::info('Password reset code validation failed: attempt expired.', [
+                        'email_fingerprint' => $emailFingerprint,
+                        'attempt_id' => $attempt->getKey(),
+                    ]);
+
+                    return self::CODE_EXPIRED;
                }

                $attempt->update([
                    'status' => ResetPasswordAttempt::STATUS_VALIDATED,
                ]);

-                return true;
+                return self::CODE_VALID;
            });
        } catch (Throwable $exception) {
            Log::error('Failed to validate password reset code.', [
@@ -214,6 +233,19 @@ class ResetPasswordAttemptService
                    return false;
                }

+                if ($attempt->expires_at?->isPast()) {
+                    $attempt->update([
+                        'status' => ResetPasswordAttempt::STATUS_EXPIRED,
+                    ]);
+
+                    Log::info('Password reset failed: attempt expired.', [
+                        'email_fingerprint' => $emailFingerprint,
+                        'attempt_id' => $attempt->getKey(),
+                    ]);
+
+                    return false;
+                }
+
                $user->password = $password;
                $user->failed_login_attempts = 0;
                $user->last_failed_login_at = null;
@@ -270,6 +302,7 @@ class ResetPasswordAttemptService
            'codigo' => $this->generateCode(),
            'reason' => $reason,
            'status' => ResetPasswordAttempt::STATUS_PENDING,
+            'expires_at' => now()->addMinutes((int) config('auth.passwords.users.expire')),
        ]);

        return $attempt->getKey();
--- a/app/Domains/Cart/Models/Cart.php
+++ b/app/Domains/Cart/Models/Cart.php
@@ -5,6 +5,7 @@ namespace App\Domains\Cart\Models;
 use App\Domains\Auth\Models\User;
 use App\Domains\Catalog\Models\CatalogItem;
 use App\Domains\Catalog\Models\Inventory;
+use App\Domains\Catalog\Models\StockReservation;
 use App\Domains\Catalog\Models\Variant;
 use App\Domains\Catalog\Services\CatalogInventoryService;
 use App\Domains\Catalog\Services\StockReservationService;
@@ -28,6 +29,7 @@ use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
    'status',
    'origin',
    'current_purchase_id',
+    'current_stock_reservation_id',
 ])]
 class Cart extends Model
 {
@@ -36,6 +38,16 @@ class Cart extends Model

    protected $table = 'carritos';

+    public const STATUS_ACTIVE = 'active';
+
+    public const STATUS_CHECKOUT = 'checkout';
+
+    public const STATUS_CONVERTED = 'converted';
+
+    public const STATUS_EXPIRED = 'expired';
+
+    public const STATUS_ABANDONED = 'abandoned';
+
    public const ORIGIN_USER = 'user';

    public const ORIGIN_DIRECT_CHECKOUT = 'direct_checkout';
@@ -45,6 +57,7 @@ class Cart extends Model
        return [
            'user_id' => 'integer',
            'current_purchase_id' => 'integer',
+            'current_stock_reservation_id' => 'integer',
        ];
    }

@@ -84,6 +97,15 @@ class Cart extends Model
        return $this->belongsTo(Purchase::class, 'current_purchase_id');
    }

+    /** @return BelongsTo<StockReservation, $this> */
+    public function currentStockReservation(): BelongsTo
+    {
+        return $this->belongsTo(
+            StockReservation::class,
+            'current_stock_reservation_id',
+        );
+    }
+
    public function getTotalAmount(): float
    {
        $items = $this->relationLoaded('items')
@@ -107,6 +129,7 @@ class Cart extends Model

        return DB::transaction(function () use ($catalogItemId, $variantId, $quantity): CartItem {
            $this->invalidateCurrentCheckout();
+            app(StockReservationService::class)->assertCartReservationUsable($this);
            $selectedItem = $this->resolveScopedItem($catalogItemId, $variantId, true);
            $cartQuantity = (int) $this->items()
                ->where('catalog_item_id', $catalogItemId)
@@ -140,12 +163,11 @@ class Cart extends Model
                    'cantidad' => $quantity,
                ]);
            } else {
-                app(StockReservationService::class)->ensure($item, $selectedItem);
                $item->cantidad += $quantity;
                $item->save();
            }

-            app(StockReservationService::class)->reserve($item, $selectedItem, $quantity);
+            app(StockReservationService::class)->syncCart($this);

            return $item->fresh();
        });
@@ -172,6 +194,7 @@ class Cart extends Model
            $excludedPurchaseId,
        ): CartItem {
            $this->invalidateCurrentCheckout();
+            app(StockReservationService::class)->assertCartReservationUsable($this);

            /** @var CartItem $item */
            $item = $this->items()
@@ -205,7 +228,6 @@ class Cart extends Model
                    $nextAvailableQuantity,
                );

-                app(StockReservationService::class)->release($item, $currentSelection, $item->cantidad);
                $availableQuantity = $inventoryService->availableQuantity($nextSelection);

                if ($availableQuantity !== null && $availableQuantity < $quantity) {
@@ -222,11 +244,10 @@ class Cart extends Model
                    ->first();

                if ($targetItem !== null) {
-                    app(StockReservationService::class)->ensure($targetItem, $nextSelection);
                    $targetItem->cantidad += $quantity;
                    $targetItem->save();
-                    app(StockReservationService::class)->reserve($targetItem, $nextSelection, $quantity);
                    $item->delete();
+                    app(StockReservationService::class)->syncCart($this);

                    return $targetItem->fresh();
                }
@@ -234,7 +255,7 @@ class Cart extends Model
                $item->variant_id = $variantId;
                $item->cantidad = $quantity;
                $item->save();
-                app(StockReservationService::class)->reserve($item, $nextSelection, $quantity);
+                app(StockReservationService::class)->syncCart($this);

                return $item->fresh();
            }
@@ -263,16 +284,9 @@ class Cart extends Model
                ]);
            }

-            if ($delta > 0) {
-                app(StockReservationService::class)->reserve($item, $currentSelection, $delta);
-            }
-
-            if ($delta < 0) {
-                app(StockReservationService::class)->release($item, $currentSelection, abs($delta));
-            }
-
            $item->cantidad = $quantity;
            $item->save();
+            app(StockReservationService::class)->syncCart($this);

            return $item->fresh();
        });
@@ -282,6 +296,7 @@ class Cart extends Model
    {
        DB::transaction(function () use ($cartItemId): void {
            $this->invalidateCurrentCheckout();
+            app(StockReservationService::class)->assertCartReservationUsable($this);

            /** @var CartItem $item */
            $item = $this->items()
@@ -289,17 +304,8 @@ class Cart extends Model
                ->lockForUpdate()
                ->firstOrFail();

-            $selectedItem = $this->resolveScopedItem(
-                $item->catalog_item_id,
-                $item->variant_id,
-                true,
-            );
-            app(StockReservationService::class)->release(
-                $item,
-                $selectedItem,
-                $item->cantidad,
-            );
            $item->delete();
+            app(StockReservationService::class)->syncCart($this);
        });
    }

@@ -341,13 +347,20 @@ class Cart extends Model
            Purchase::STATUS_CREATED,
            Purchase::STATUS_PENDING_PAYMENT,
        ], true)) {
+            app(StockReservationService::class)->returnToCart($currentPurchase, $cart);
            $currentPurchase->update([
                'status' => Purchase::STATUS_SUPERSEDED,
-                'expires_at' => null,
            ]);
+
+            $this->current_purchase_id = null;
+
+            return;
        }

-        app(StockReservationService::class)->detachFromPurchase($currentPurchase);
+        app(StockReservationService::class)->releaseForPurchase(
+            $currentPurchase,
+            reason: StockReservationService::REASON_PURCHASE_SUPERSEDED,
+        );
        self::query()
            ->whereKey($cart->getKey())
            ->where('current_purchase_id', $currentPurchase->getKey())
--- a/app/Domains/Cart/Models/CartItem.php
+++ b/app/Domains/Cart/Models/CartItem.php
@@ -3,13 +3,11 @@
 namespace App\Domains\Cart\Models;

 use App\Domains\Catalog\Models\CatalogItem;
-use App\Domains\Catalog\Models\StockReservation;
 use App\Domains\Catalog\Models\Variant;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
-use Illuminate\Database\Eloquent\Relations\HasMany;

 #[Fillable([
    'cart_id',
@@ -57,10 +55,4 @@ class CartItem extends Model
    {
        return $this->variant ?? $this->catalogItem;
    }
-
-    /** @return HasMany<StockReservation, $this> */
-    public function stockReservations(): HasMany
-    {
-        return $this->hasMany(StockReservation::class);
-    }
 }
--- a/app/Domains/Cart/Services/CartService.php
+++ b/app/Domains/Cart/Services/CartService.php
@@ -4,9 +4,12 @@ namespace App\Domains\Cart\Services;

 use App\Domains\Auth\Models\User;
 use App\Domains\Cart\Models\Cart;
+use App\Domains\Catalog\Exceptions\StockReservationExpiredException;
+use App\Domains\Catalog\Services\ExpireStockReservationsService;
 use App\Domains\Tenant\Models\Tenant;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Str;
 use Illuminate\Validation\ValidationException;
 use Symfony\Component\HttpFoundation\Cookie;
@@ -22,7 +25,7 @@ class CartService
            return $this->makeEmptyCart($tenant);
        }

-        $cart = $this->findCart($tenant, $resolvedIdentity['identity']);
+        $cart = $this->resolveCart($tenant, $resolvedIdentity['identity']);

        if ($cart === null) {
            return $this->makeEmptyCart($tenant);
@@ -119,7 +122,7 @@ class CartService
    {
        $cart = new Cart([
            'tenant_codigo' => $tenant->codigo,
-            'status' => 'active',
+            'status' => Cart::STATUS_ACTIVE,
        ]);

        $cart->setRelation('items', collect());
@@ -220,12 +223,14 @@ class CartService
    {
        return Cart::query()
            ->where('tenant_codigo', $tenant->codigo)
-            ->where('status', 'active')
+            ->where('origin', Cart::ORIGIN_USER)
+            ->whereIn('status', [Cart::STATUS_ACTIVE, Cart::STATUS_EXPIRED])
            ->when(
                $identity['user_id'] !== null,
                fn ($query) => $query->where('user_id', $identity['user_id']),
                fn ($query) => $query->where('guest_token', $identity['guest_token']),
            )
+            ->orderByRaw('CASE WHEN status = ? THEN 0 ELSE 1 END', [Cart::STATUS_ACTIVE])
            ->first();
    }

@@ -234,7 +239,7 @@ class CartService
     */
    protected function findCartOrFail(Tenant $tenant, array $identity): Cart
    {
-        $cart = $this->findCart($tenant, $identity);
+        $cart = $this->resolveCart($tenant, $identity, replaceExpired: false);

        if ($cart === null) {
            throw new NotFoundHttpException('Cart not found.');
@@ -247,10 +252,73 @@ class CartService
     * @param  array{user_id: ?int, guest_token: ?string}  $identity
     */
    protected function findOrCreateCart(Tenant $tenant, array $identity): Cart
+    {
+        return $this->resolveCart($tenant, $identity)
+            ?? $this->createCart($tenant, $identity);
+    }
+
+    /**
+     * @param  array{user_id: ?int, guest_token: ?string}  $identity
+     */
+    protected function resolveCart(
+        Tenant $tenant,
+        array $identity,
+        bool $replaceExpired = true,
+    ): ?Cart {
+        $cart = $this->findCart($tenant, $identity);
+
+        if ($cart?->status === Cart::STATUS_ACTIVE
+            && $cart->current_stock_reservation_id !== null
+            && app(ExpireStockReservationsService::class)
+                ->expireIfOverdue($cart->current_stock_reservation_id)) {
+            $cart = $this->findCart($tenant, $identity);
+        }
+
+        if ($cart?->status === Cart::STATUS_EXPIRED) {
+            if (! $replaceExpired) {
+                throw new StockReservationExpiredException;
+            }
+
+            return $this->replaceExpiredCart($cart, $tenant, $identity);
+        }
+
+        if ($cart !== null) {
+            return $cart;
+        }
+
+        return null;
+    }
+
+    /**
+     * @param  array{user_id: ?int, guest_token: ?string}  $identity
+     */
+    protected function replaceExpiredCart(Cart $expiredCart, Tenant $tenant, array $identity): Cart
+    {
+        return DB::transaction(function () use ($expiredCart, $tenant, $identity): Cart {
+            /** @var Cart|null $lockedCart */
+            $lockedCart = Cart::query()->lockForUpdate()->find($expiredCart->getKey());
+
+            if ($lockedCart?->status === Cart::STATUS_EXPIRED) {
+                $lockedCart->update([
+                    'status' => Cart::STATUS_ABANDONED,
+                    'current_purchase_id' => null,
+                ]);
+            }
+
+            return $this->findCart($tenant, $identity)
+                ?? $this->createCart($tenant, $identity);
+        });
+    }
+
+    /**
+     * @param  array{user_id: ?int, guest_token: ?string}  $identity
+     */
+    protected function createCart(Tenant $tenant, array $identity): Cart
    {
        $attributes = [
            'tenant_codigo' => $tenant->codigo,
-            'status' => 'active',
+            'status' => Cart::STATUS_ACTIVE,
+            'origin' => Cart::ORIGIN_USER,
        ];

        if ($identity['user_id'] !== null) {
--- a/app/Domains/Cart/Services/ExpireCartReservationsService.php
+++ b/app/Domains/Cart/Services/ExpireCartReservationsService.php
@@ -1,123 +0,0 @@
-<?php
-
-namespace App\Domains\Cart\Services;
-
-use App\Domains\Cart\Models\Cart;
-use App\Domains\Cart\Models\CartItem;
-use App\Domains\Catalog\Models\Inventory;
-use App\Domains\Catalog\Models\StockReservation;
-use Illuminate\Support\Facades\DB;
-
-class ExpireCartReservationsService
-{
-    public function expireOverdue(): int
-    {
-        $expiredItems = 0;
-        $lastCartItemId = 0;
-
-        do {
-            $cartItemIds = StockReservation::query()
-                ->where('status', StockReservation::STATUS_ACTIVE)
-                ->whereNull('purchase_id')
-                ->whereNotNull('cart_item_id')
-                ->whereNotNull('expires_at')
-                ->where('expires_at', '<=', now())
-                ->where('cart_item_id', '>', $lastCartItemId)
-                ->whereHas('cartItem.cart', fn ($query) => $query->where('status', 'active'))
-                ->select('cart_item_id')
-                ->distinct()
-                ->orderBy('cart_item_id')
-                ->limit(500)
-                ->pluck('cart_item_id');
-
-            foreach ($cartItemIds as $cartItemId) {
-                $lastCartItemId = (int) $cartItemId;
-
-                if ($this->expireCartItem($lastCartItemId)) {
-                    $expiredItems++;
-                }
-            }
-        } while ($cartItemIds->count() === 500);
-
-        return $expiredItems;
-    }
-
-    private function expireCartItem(int $cartItemId): bool
-    {
-        /** @var CartItem|null $candidate */
-        $candidate = CartItem::query()->select(['id', 'cart_id'])->find($cartItemId);
-        if ($candidate === null) {
-            return false;
-        }
-
-        return DB::transaction(function () use ($candidate, $cartItemId): bool {
-            /** @var Cart|null $cart */
-            $cart = Cart::query()
-                ->whereKey($candidate->cart_id)
-                ->where('status', 'active')
-                ->lockForUpdate()
-                ->first();
-
-            if ($cart === null) {
-                return false;
-            }
-
-            /** @var CartItem|null $cartItem */
-            $cartItem = $cart->items()
-                ->whereKey($cartItemId)
-                ->lockForUpdate()
-                ->first();
-
-            if ($cartItem === null) {
-                return false;
-            }
-
-            $reservations = StockReservation::query()
-                ->where('cart_item_id', $cartItem->getKey())
-                ->where('status', StockReservation::STATUS_ACTIVE)
-                ->orderBy('inventory_id')
-                ->lockForUpdate()
-                ->get();
-
-            if (
-                $reservations->isEmpty()
-                || $reservations->contains(
-                    fn (StockReservation $reservation): bool => $reservation->purchase_id !== null
-                        || $reservation->expires_at === null
-                        || $reservation->expires_at->isFuture(),
-                )
-            ) {
-                return false;
-            }
-
-            $inventories = Inventory::query()
-                ->whereKey($reservations->pluck('inventory_id'))
-                ->orderBy('id')
-                ->lockForUpdate()
-                ->get()
-                ->keyBy('id');
-
-            foreach ($reservations as $reservation) {
-                $inventory = $inventories->get($reservation->inventory_id)
-                    ?? throw new \InvalidArgumentException('No se encontro el inventario reservado.');
-
-                $inventory->release((int) $reservation->quantity);
-                $reservation->update([
-                    'quantity' => 0,
-                    'status' => StockReservation::STATUS_EXPIRED,
-                    'expires_at' => null,
-                    'released_at' => now(),
-                ]);
-            }
-
-            $cartItem->delete();
-
-            if (! $cart->items()->exists()) {
-                $cart->update(['status' => 'expired']);
-                $cart->delete();
-            }
-
-            return true;
-        });
-    }
-}
--- a/app/Domains/Cart/documentacion/README.md
+++ b/app/Domains/Cart/documentacion/README.md
@@ -6,13 +6,12 @@ Gestiona el carrito activo de un tenant tanto para visitantes como para usuarios

 ## Modelo

- `Cart`: pertenece a un tenant y opcionalmente a un usuario; calcula el total y permite agregar, actualizar o quitar ítems.
+- `Cart`: pertenece a un tenant y opcionalmente a un usuario; calcula el total, permite agregar, actualizar o quitar ítems y apunta a su reserva de stock vigente mediante `current_stock_reservation_id`.
 - `CartItem`: referencia un `CatalogItem` y, opcionalmente, una `Variant`; sólo persiste la selección y cantidad, y expone siempre los datos vigentes del catálogo.

 ## Servicios

 - `CartService`: obtiene el carrito, modifica ítems y administra la cookie del token invitado.
- `ExpireCartReservationsService`: libera las reservas vencidas de carritos activos y elimina los carritos que quedan vacíos.
 - `GuestCartMergeService`: incorpora el carrito invitado al usuario cuando este se autentica.

 ## Endpoints
@@ -34,4 +33,6 @@ Depende de `Catalog` para productos y variantes, de `Tenant` para aislar datos y

 Un carrito puede pasar a `checkout`. Las compras directas usan un carrito técnico con `origin=direct_checkout`; los carritos normales conservan `origin=user` y pueden restaurarse al cancelar o vencer la compra.

-El comando unificado `php artisan reservations:expire` procesa primero las compras vencidas y luego las reservas activas sin compra cuyo `expires_at` haya vencido. Se ejecuta cada minuto mediante el scheduler, conserva la fila de reserva con estado `expired`, elimina el ítem abandonado y elimina lógicamente el carrito cuando queda vacío. Cada intento registra sus resultados o su error en el log diario `storage/logs/commands/commands-AAAA-MM-DD.log`.
+Cada edición sincroniza una única reserva para el carrito completo. Si varios ítems o bundles consumen el mismo inventario, se persiste una sola línea con la cantidad agregada. Al editar durante checkout, la compra anterior queda `superseded`, se desvincula y el carrito conserva la misma reserva activa con sus líneas actualizadas.
+
+El comando unificado `php artisan reservations:expire` recorre una sola vez las reservas activas cuyo `expires_at` haya vencido. Cuando pertenecen a un carrito, conserva la reserva y sus líneas como historial, libera el stock como conjunto y cambia el carrito asociado a `expired` sin eliminar sus ítems. Al volver a resolver ese carrito desde la API, el anterior pasa automáticamente a `abandoned` y se crea uno activo y vacío para la misma identidad. El cliente nunca necesita reiniciarlo explícitamente. La API también materializa este vencimiento al acceder al carrito aunque el comando programado todavía no haya corrido.
--- a/app/Domains/Catalog/Exceptions/StockReservationExpiredException.php
+++ b/app/Domains/Catalog/Exceptions/StockReservationExpiredException.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Domains\Catalog\Exceptions;
+
+use RuntimeException;
+
+class StockReservationExpiredException extends RuntimeException
+{
+    public function __construct()
+    {
+        parent::__construct(__('api.cart.reservation_expired'));
+    }
+}
--- a/app/Domains/Catalog/Models/Inventory.php
+++ b/app/Domains/Catalog/Models/Inventory.php
@@ -48,10 +48,10 @@ class Inventory extends Model
        return $this->hasOne(Variant::class);
    }

-    /** @return HasMany<StockReservation, $this> */
-    public function stockReservations(): HasMany
+    /** @return HasMany<StockReservationLine, $this> */
+    public function stockReservationLines(): HasMany
    {
-        return $this->hasMany(StockReservation::class);
+        return $this->hasMany(StockReservationLine::class);
    }

    public function availableStock(): int
--- a/app/Domains/Catalog/Models/StockReservation.php
+++ b/app/Domains/Catalog/Models/StockReservation.php
@@ -2,21 +2,20 @@

 namespace App\Domains\Catalog\Models;

-use App\Domains\Cart\Models\CartItem;
+use App\Domains\Cart\Models\Cart;
 use App\Domains\Purchase\Models\Purchase;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Model;
-use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\HasOne;

 #[Fillable([
-    'inventory_id',
-    'cart_item_id',
-    'purchase_id',
-    'quantity',
    'status',
    'expires_at',
    'committed_at',
    'released_at',
+    'expired_at',
+    'release_reason',
 ])]
 class StockReservation extends Model
 {
@@ -31,31 +30,28 @@ class StockReservation extends Model
    protected function casts(): array
    {
        return [
-            'inventory_id' => 'integer',
-            'cart_item_id' => 'integer',
-            'purchase_id' => 'integer',
-            'quantity' => 'integer',
            'expires_at' => 'datetime',
            'committed_at' => 'datetime',
            'released_at' => 'datetime',
+            'expired_at' => 'datetime',
        ];
    }

-    /** @return BelongsTo<Inventory, $this> */
-    public function inventory(): BelongsTo
+    /** @return HasMany<StockReservationLine, $this> */
+    public function lines(): HasMany
    {
-        return $this->belongsTo(Inventory::class);
+        return $this->hasMany(StockReservationLine::class);
    }

-    /** @return BelongsTo<CartItem, $this> */
-    public function cartItem(): BelongsTo
+    /** @return HasOne<Cart, $this> */
+    public function currentCart(): HasOne
    {
-        return $this->belongsTo(CartItem::class);
+        return $this->hasOne(Cart::class, 'current_stock_reservation_id');
    }

-    /** @return BelongsTo<Purchase, $this> */
-    public function purchase(): BelongsTo
+    /** @return HasOne<Purchase, $this> */
+    public function purchase(): HasOne
    {
-        return $this->belongsTo(Purchase::class);
+        return $this->hasOne(Purchase::class);
    }
 }
--- a/app/Domains/Catalog/Models/StockReservationLine.php
+++ b/app/Domains/Catalog/Models/StockReservationLine.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Domains\Catalog\Models;
+
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+#[Fillable([
+    'stock_reservation_id',
+    'inventory_id',
+    'quantity',
+    'tracks_inventory',
+])]
+class StockReservationLine extends Model
+{
+    protected function casts(): array
+    {
+        return [
+            'stock_reservation_id' => 'integer',
+            'inventory_id' => 'integer',
+            'quantity' => 'integer',
+            'tracks_inventory' => 'boolean',
+        ];
+    }
+
+    /** @return BelongsTo<StockReservation, $this> */
+    public function reservation(): BelongsTo
+    {
+        return $this->belongsTo(StockReservation::class, 'stock_reservation_id');
+    }
+
+    /** @return BelongsTo<Inventory, $this> */
+    public function inventory(): BelongsTo
+    {
+        return $this->belongsTo(Inventory::class);
+    }
+}
--- a/app/Domains/Catalog/Services/CatalogInventoryService.php
+++ b/app/Domains/Catalog/Services/CatalogInventoryService.php
@@ -25,6 +25,24 @@ class CatalogInventoryService
        );
    }

+    /**
+     * @return array<int, array{quantity: int, tracks_inventory: bool}>
+     */
+    public function detailedRequirementsFor(CatalogItem|Variant $selection, int $quantity = 1): array
+    {
+        if ($quantity <= 0) {
+            throw new \InvalidArgumentException('La cantidad debe ser mayor a cero.');
+        }
+
+        return array_map(
+            fn (array $requirement): array => [
+                ...$requirement,
+                'quantity' => $requirement['quantity'] * $quantity,
+            ],
+            $this->inventoryRequirements($selection),
+        );
+    }
+
    public function availableQuantity(CatalogItem|Variant $selection): ?int
    {
        if ($selection instanceof CatalogItem
--- a/app/Domains/Catalog/Services/ExpireStockReservationsService.php
+++ b/app/Domains/Catalog/Services/ExpireStockReservationsService.php
@@ -2,50 +2,184 @@

 namespace App\Domains\Catalog\Services;

-use App\Domains\Cart\Services\ExpireCartReservationsService;
-use App\Domains\Purchase\Services\CheckoutService;
+use App\Domains\Cart\Models\Cart;
+use App\Domains\Catalog\Models\StockReservation;
+use App\Domains\Purchase\Models\Purchase;
+use App\Domains\Purchase\Services\Checkout\ReleaseCheckoutService;
+use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Log;
+use RuntimeException;
 use Throwable;

 class ExpireStockReservationsService
 {
+    private const BATCH_SIZE = 500;
+
    public function __construct(
-        private readonly CheckoutService $checkout,
-        private readonly ExpireCartReservationsService $carts,
+        private readonly ReleaseCheckoutService $purchases,
+        private readonly StockReservationService $reservations,
    ) {}

    /**
-     * @return array{purchases: int, cart_items: int}
+     * @return array{purchases: int, cart_reservations: int, orphan_reservations: int, failed: int}
     */
    public function expireOverdue(): array
    {
-        $expiredPurchases = null;
-        $expiredCartItems = null;
+        $summary = [
+            'purchases' => 0,
+            'cart_reservations' => 0,
+            'orphan_reservations' => 0,
+            'failed' => 0,
+        ];
+        $lastReservationId = 0;

-        try {
-            $expiredPurchases = $this->checkout->expireOverduePurchases();
-            $expiredCartItems = $this->carts->expireOverdue();
+        do {
+            $reservationIds = StockReservation::query()
+                ->where('status', StockReservation::STATUS_ACTIVE)
+                ->whereNotNull('expires_at')
+                ->where('expires_at', '<=', now())
+                ->where('id', '>', $lastReservationId)
+                ->orderBy('id')
+                ->limit(self::BATCH_SIZE)
+                ->pluck('id');

-            Log::channel('commands')->info('Stock reservation cleanup completed.', [
-                'command' => 'reservations:expire',
-                'expired_purchases' => $expiredPurchases,
-                'expired_cart_items' => $expiredCartItems,
-                'total_expired' => $expiredPurchases + $expiredCartItems,
-            ]);
+            foreach ($reservationIds as $reservationId) {
+                $lastReservationId = (int) $reservationId;

-            return [
-                'purchases' => $expiredPurchases,
-                'cart_items' => $expiredCartItems,
-            ];
-        } catch (Throwable $exception) {
-            Log::channel('commands')->error('Stock reservation cleanup failed.', [
-                'command' => 'reservations:expire',
-                'expired_purchases' => $expiredPurchases,
-                'expired_cart_items' => $expiredCartItems,
-                'exception' => $exception,
-            ]);
+                try {
+                    $owner = $this->expireReservation($lastReservationId);
+                    if ($owner !== null) {
+                        $summary[$owner]++;
+                    }
+                } catch (Throwable $exception) {
+                    $summary['failed']++;
+                    Log::channel('commands')->error('Failed to expire overdue stock reservation.', [
+                        'command' => 'reservations:expire',
+                        'stock_reservation_id' => $lastReservationId,
+                        'exception' => $exception,
+                    ]);
+                }
+            }
+        } while ($reservationIds->count() === self::BATCH_SIZE);

-            throw $exception;
+        Log::channel('commands')->info('Stock reservation cleanup completed.', [
+            'command' => 'reservations:expire',
+            'expired_purchases' => $summary['purchases'],
+            'expired_cart_reservations' => $summary['cart_reservations'],
+            'expired_orphan_reservations' => $summary['orphan_reservations'],
+            'failed_reservations' => $summary['failed'],
+            'total_expired' => $summary['purchases']
+                + $summary['cart_reservations']
+                + $summary['orphan_reservations'],
+        ]);
+
+        return $summary;
+    }
+
+    public function expireIfOverdue(int $reservationId): bool
+    {
+        /** @var StockReservation|null $reservation */
+        $reservation = StockReservation::query()->find($reservationId);
+        if ($reservation?->status === StockReservation::STATUS_EXPIRED) {
+            return true;
        }
+        if (! $this->isOverdue($reservation)) {
+            return false;
+        }
+
+        return $this->expireReservation($reservationId) !== null;
+    }
+
+    /** @return 'purchases'|'cart_reservations'|'orphan_reservations'|null */
+    private function expireReservation(int $reservationId): ?string
+    {
+        $purchaseId = Purchase::query()
+            ->where('stock_reservation_id', $reservationId)
+            ->value('id');
+        if ($purchaseId !== null) {
+            return $this->expirePurchase((int) $purchaseId);
+        }
+
+        $cartId = Cart::query()
+            ->where('current_stock_reservation_id', $reservationId)
+            ->where('status', 'active')
+            ->value('id');
+        if ($cartId !== null) {
+            return $this->expireCart((int) $cartId, $reservationId);
+        }
+
+        return $this->expireOrphan($reservationId);
+    }
+
+    /** @return 'purchases'|null */
+    private function expirePurchase(int $purchaseId): ?string
+    {
+        /** @var Purchase|null $purchase */
+        $purchase = Purchase::query()->find($purchaseId);
+        if ($purchase === null) {
+            return null;
+        }
+
+        $purchase = $this->purchases->expire($purchase);
+        if ($purchase->status === Purchase::STATUS_EXPIRED) {
+            return 'purchases';
+        }
+
+        $reservation = $purchase->stockReservation;
+        if ($this->isOverdue($reservation)) {
+            throw new RuntimeException('An overdue active reservation belongs to a purchase that cannot expire.');
+        }
+
+        return null;
+    }
+
+    /** @return 'cart_reservations'|null */
+    private function expireCart(int $cartId, int $reservationId): ?string
+    {
+        return DB::transaction(function () use ($cartId, $reservationId): ?string {
+            /** @var Cart|null $cart */
+            $cart = Cart::query()
+                ->whereKey($cartId)
+                ->where('current_stock_reservation_id', $reservationId)
+                ->where('status', Cart::STATUS_ACTIVE)
+                ->lockForUpdate()
+                ->first();
+            if ($cart === null) {
+                return null;
+            }
+
+            /** @var StockReservation|null $reservation */
+            $reservation = StockReservation::query()->lockForUpdate()->find($reservationId);
+            if (! $this->isOverdue($reservation)) {
+                return null;
+            }
+
+            $this->reservations->expire($reservation);
+            $cart->update(['status' => Cart::STATUS_EXPIRED]);
+
+            return 'cart_reservations';
+        });
+    }
+
+    /** @return 'orphan_reservations'|null */
+    private function expireOrphan(int $reservationId): ?string
+    {
+        /** @var StockReservation|null $reservation */
+        $reservation = StockReservation::query()->find($reservationId);
+        if (! $this->isOverdue($reservation)) {
+            return null;
+        }
+
+        $this->reservations->expire($reservation);
+
+        return 'orphan_reservations';
+    }
+
+    private function isOverdue(?StockReservation $reservation): bool
+    {
+        return $reservation !== null
+            && $reservation->status === StockReservation::STATUS_ACTIVE
+            && $reservation->expires_at !== null
+            && ! $reservation->expires_at->isFuture();
    }
 }
--- a/app/Domains/Catalog/Services/StockReservationService.php
+++ b/app/Domains/Catalog/Services/StockReservationService.php
@@ -2,262 +2,486 @@

 namespace App\Domains\Catalog\Services;

+use App\Domains\Cart\Models\Cart;
 use App\Domains\Cart\Models\CartItem;
-use App\Domains\Catalog\Models\CatalogItem;
+use App\Domains\Catalog\Exceptions\StockReservationExpiredException;
+use App\Domains\Catalog\Models\Inventory;
 use App\Domains\Catalog\Models\StockReservation;
-use App\Domains\Catalog\Models\Variant;
+use App\Domains\Catalog\Models\StockReservationLine;
 use App\Domains\Purchase\Models\Purchase;
 use Illuminate\Support\Carbon;
+use Illuminate\Support\Collection;
 use Illuminate\Support\Facades\DB;

 class StockReservationService
 {
+    public const REASON_CART_EMPTY = 'cart_empty';
+
+    public const REASON_CART_CHANGED = 'cart_changed';
+
+    public const REASON_PURCHASE_SUPERSEDED = 'purchase_superseded';
+
+    public const REASON_PURCHASE_CANCELLED = 'purchase_cancelled';
+
+    public const REASON_PAYMENT_REJECTED = 'payment_rejected';
+
+    public const REASON_MANUAL_RELEASE = 'manual_release';
+
    public function __construct(
        private readonly CatalogInventoryService $inventory,
    ) {}

-    public function reserve(CartItem $cartItem, CatalogItem|Variant $selection, int $quantity): void
+    public function syncCart(Cart $cart): ?StockReservation
    {
-        DB::transaction(function () use ($cartItem, $selection, $quantity): void {
-            $this->inventory->reserve($selection, $quantity);
-            $this->recordIncrease($cartItem, $selection, $quantity);
-        });
-    }
+        return DB::transaction(function () use ($cart): ?StockReservation {
+            /** @var Cart $lockedCart */
+            $lockedCart = Cart::query()->lockForUpdate()->findOrFail($cart->getKey());
+            $items = $lockedCart->items()->orderBy('id')->lockForUpdate()->get();
+            $this->loadSelections($items);
+            $requirements = $this->requirementsForItems($items);

-    public function release(
-        CartItem $cartItem,
-        CatalogItem|Variant $selection,
-        int $quantity,
-        string $releasedStatus = StockReservation::STATUS_RELEASED,
-    ): void {
-        DB::transaction(function () use ($cartItem, $selection, $quantity, $releasedStatus): void {
-            $this->ensure($cartItem, $selection);
-            $this->inventory->release($selection, $quantity);
-            $this->recordDecrease($cartItem, $selection, $quantity, $releasedStatus);
-        });
-    }
+            $reservation = $lockedCart->current_stock_reservation_id === null
+                ? null
+                : StockReservation::query()->lockForUpdate()->find($lockedCart->current_stock_reservation_id);

-    public function commit(
-        CartItem $cartItem,
-        CatalogItem|Variant $selection,
-        Purchase $purchase,
-    ): void {
-        DB::transaction(function () use ($cartItem, $selection, $purchase): void {
-            $this->ensure($cartItem, $selection);
-            $this->inventory->commit($selection, (int) $cartItem->cantidad);
+            if ($reservation !== null) {
+                $this->assertUsableCartReservation($reservation);
+            }

-            $requirements = $this->inventory->requirementsFor($selection, (int) $cartItem->cantidad);
-            foreach ($requirements as $inventoryId => $quantity) {
-                $reservation = $this->lockReservation($cartItem, $inventoryId);
-                if (
-                    $reservation === null
-                    || $reservation->status !== StockReservation::STATUS_ACTIVE
-                    || $reservation->purchase_id !== $purchase->getKey()
-                    || $reservation->quantity !== $quantity
-                ) {
-                    throw new \InvalidArgumentException('La reserva de stock no coincide con el item del carrito.');
+            if ($requirements === []) {
+                if ($reservation !== null && $reservation->status === StockReservation::STATUS_ACTIVE) {
+                    $this->finalizeLocked(
+                        $reservation,
+                        StockReservation::STATUS_RELEASED,
+                        self::REASON_CART_EMPTY,
+                    );
                }

-                $reservation->update([
-                    'status' => StockReservation::STATUS_COMMITTED,
-                    'committed_at' => now(),
-                    'expires_at' => null,
-                ]);
+                $lockedCart->update(['current_stock_reservation_id' => null]);
+                $cart->current_stock_reservation_id = null;
+
+                return null;
            }
-        });
-    }
-
-    public function ensure(CartItem $cartItem, CatalogItem|Variant $selection): void
-    {
-        $requirements = $this->inventory->requirementsFor($selection, (int) $cartItem->cantidad);
-
-        foreach ($requirements as $inventoryId => $quantity) {
-            $reservation = $this->lockReservation($cartItem, $inventoryId);

            if ($reservation === null) {
-                StockReservation::query()->create([
-                    'inventory_id' => $inventoryId,
-                    'cart_item_id' => $cartItem->getKey(),
-                    'quantity' => $quantity,
+                $reservation = StockReservation::query()->create([
                    'status' => StockReservation::STATUS_ACTIVE,
                    'expires_at' => $this->expiration(),
                ]);
-
-                continue;
+                $lockedCart->update(['current_stock_reservation_id' => $reservation->getKey()]);
            }

-            if ($reservation->status !== StockReservation::STATUS_ACTIVE || $reservation->quantity !== $quantity) {
-                $reservation->update([
-                    'quantity' => $quantity,
-                    'status' => StockReservation::STATUS_ACTIVE,
-                    'committed_at' => null,
-                    'released_at' => null,
-                    'expires_at' => $this->expiration(),
-                ]);
+            if (Purchase::query()->where('stock_reservation_id', $reservation->getKey())->exists()) {
+                throw new \InvalidArgumentException('La reserva vinculada a una compra no se puede modificar.');
            }
-        }
-    }

-    public function attachToPurchase(
-        CartItem $cartItem,
-        CatalogItem|Variant $selection,
-        Purchase $purchase,
-    ): void {
-        DB::transaction(function () use ($cartItem, $selection, $purchase): void {
-            $this->ensure($cartItem, $selection);
-            StockReservation::query()
-                ->where('cart_item_id', $cartItem->getKey())
-                ->where('status', StockReservation::STATUS_ACTIVE)
-                ->update([
-                    'purchase_id' => $purchase->getKey(),
-                    'expires_at' => $purchase->expires_at,
-                ]);
-        });
-    }
-
-    public function detachFromPurchase(Purchase $purchase): void
-    {
-        StockReservation::query()
-            ->where('purchase_id', $purchase->getKey())
-            ->where('status', StockReservation::STATUS_ACTIVE)
-            ->update([
-                'purchase_id' => null,
-                'expires_at' => $this->expiration(),
-            ]);
-    }
-
-    public function restore(CartItem $cartItem, CatalogItem|Variant $selection): void
-    {
-        DB::transaction(function () use ($cartItem, $selection): void {
-            $requirements = $this->inventory->requirementsFor(
-                $selection,
-                (int) $cartItem->cantidad,
-            );
-            $activeReservations = StockReservation::query()
-                ->where('cart_item_id', $cartItem->getKey())
-                ->where('status', StockReservation::STATUS_ACTIVE)
+            $currentLines = StockReservationLine::query()
+                ->where('stock_reservation_id', $reservation->getKey())
+                ->orderBy('inventory_id')
                ->lockForUpdate()
                ->get()
                ->keyBy('inventory_id');
-
-            $hasCompleteReservation = collect($requirements)->every(
-                fn (int $quantity, int $inventoryId): bool => (int) ($activeReservations->get($inventoryId)?->quantity ?? 0) === $quantity,
-            );
-
-            if ($hasCompleteReservation) {
-                return;
-            }
-
-            if ($activeReservations->isNotEmpty()) {
-                throw new \InvalidArgumentException('La reserva de stock del carrito es inconsistente.');
-            }
-
-            $this->inventory->reserve($selection, (int) $cartItem->cantidad);
-            $this->recordIncrease($cartItem, $selection, (int) $cartItem->cantidad);
-        });
-    }
-
-    public function syncPurchaseExpiration(Purchase $purchase): void
-    {
-        StockReservation::query()
-            ->where('purchase_id', $purchase->getKey())
-            ->where('status', StockReservation::STATUS_ACTIVE)
-            ->update(['expires_at' => $purchase->expires_at]);
-    }
-
-    public function transfer(CartItem $source, CartItem $target): void
-    {
-        DB::transaction(function () use ($source, $target): void {
-            $sourceReservations = StockReservation::query()
-                ->where('cart_item_id', $source->getKey())
-                ->where('status', StockReservation::STATUS_ACTIVE)
-                ->orderBy('inventory_id')
+            $inventoryIds = collect(array_keys($requirements))
+                ->merge($currentLines->keys())
+                ->map(fn ($id): int => (int) $id)
+                ->unique()
+                ->sort()
+                ->values();
+            $inventories = Inventory::query()
+                ->whereKey($inventoryIds)
+                ->orderBy('id')
                ->lockForUpdate()
-                ->get();
+                ->get()
+                ->keyBy('id');

-            foreach ($sourceReservations as $sourceReservation) {
-                $targetReservation = $this->lockReservation($target, (int) $sourceReservation->inventory_id);
+            foreach ($inventoryIds as $inventoryId) {
+                $inventory = $inventories->get($inventoryId)
+                    ?? throw new \InvalidArgumentException('No se encontró el inventario requerido.');
+                $previous = (int) ($currentLines->get($inventoryId)?->quantity ?? 0);
+                $required = (int) ($requirements[$inventoryId]['quantity'] ?? 0);
+                $delta = $required - $previous;

-                if ($targetReservation === null) {
-                    $sourceItemQuantity = (int) $source->cantidad;
-                    $targetItemQuantity = (int) $target->fresh()->cantidad;
-                    $perItemQuantity = intdiv((int) $sourceReservation->quantity, $sourceItemQuantity);
-                    $sourceReservation->update([
-                        'cart_item_id' => $target->getKey(),
-                        'purchase_id' => null,
-                        'quantity' => $perItemQuantity * $targetItemQuantity,
-                        'expires_at' => $this->expiration(),
-                    ]);
+                if ($delta > 0
+                    && $requirements[$inventoryId]['tracks_inventory']
+                    && $inventory->availableStock() < $delta) {
+                    throw new \InvalidArgumentException('No hay suficiente stock disponible para reservar el carrito.');
+                }
+
+                if ($delta < 0 && $inventory->reserved_stock < abs($delta)) {
+                    throw new \InvalidArgumentException('La reserva de stock del carrito es inconsistente.');
+                }
+            }
+
+            foreach ($inventoryIds as $inventoryId) {
+                /** @var Inventory $inventory */
+                $inventory = $inventories->get($inventoryId);
+                $line = $currentLines->get($inventoryId);
+                $previous = (int) ($line?->quantity ?? 0);
+                $required = (int) ($requirements[$inventoryId]['quantity'] ?? 0);
+                $delta = $required - $previous;
+
+                if ($delta > 0) {
+                    $inventory->reserve($delta, $requirements[$inventoryId]['tracks_inventory']);
+                } elseif ($delta < 0) {
+                    $inventory->release(abs($delta));
+                }
+
+                if ($required === 0) {
+                    $line?->delete();

                    continue;
                }

-                $targetReservation->update([
-                    'quantity' => $targetReservation->quantity + $sourceReservation->quantity,
-                    'status' => StockReservation::STATUS_ACTIVE,
-                    'expires_at' => $this->expiration(),
-                ]);
-                $sourceReservation->delete();
+                StockReservationLine::query()->updateOrCreate(
+                    [
+                        'stock_reservation_id' => $reservation->getKey(),
+                        'inventory_id' => $inventoryId,
+                    ],
+                    [
+                        'quantity' => $required,
+                        'tracks_inventory' => $requirements[$inventoryId]['tracks_inventory'],
+                    ],
+                );
+            }
+
+            $reservation->update([
+                'expires_at' => $this->expiration(),
+                'release_reason' => null,
+            ]);
+            $cart->current_stock_reservation_id = $reservation->getKey();
+
+            return $reservation->fresh('lines');
+        });
+    }
+
+    public function attachToPurchase(
+        Cart $cart,
+        Purchase $purchase,
+        Carbon $expiresAt,
+    ): StockReservation {
+        return DB::transaction(function () use ($cart, $purchase, $expiresAt): StockReservation {
+            /** @var Cart $lockedCart */
+            $lockedCart = Cart::query()->lockForUpdate()->findOrFail($cart->getKey());
+            /** @var Purchase $lockedPurchase */
+            $lockedPurchase = Purchase::query()->lockForUpdate()->findOrFail($purchase->getKey());
+
+            if ($lockedCart->current_stock_reservation_id === null) {
+                throw new \InvalidArgumentException('El carrito no tiene una reserva de stock activa.');
+            }
+
+            /** @var StockReservation $reservation */
+            $reservation = StockReservation::query()->lockForUpdate()->findOrFail($lockedCart->current_stock_reservation_id);
+            $this->assertUsableCartReservation($reservation);
+
+            $linkedPurchase = Purchase::query()
+                ->where('stock_reservation_id', $reservation->getKey())
+                ->whereKeyNot($lockedPurchase->getKey())
+                ->exists();
+            if ($linkedPurchase) {
+                throw new \InvalidArgumentException('La reserva de stock ya pertenece a otra compra.');
+            }
+
+            $lockedPurchase->update(['stock_reservation_id' => $reservation->getKey()]);
+            $reservation->update(['expires_at' => $expiresAt]);
+            $purchase->stock_reservation_id = $reservation->getKey();
+            $cart->current_stock_reservation_id = $reservation->getKey();
+
+            return $reservation->fresh('lines');
+        });
+    }
+
+    public function commit(Purchase $purchase): void
+    {
+        DB::transaction(function () use ($purchase): void {
+            /** @var Purchase $purchase */
+            $purchase = Purchase::query()->lockForUpdate()->findOrFail($purchase->getKey());
+            if ($purchase->stock_reservation_id === null) {
+                throw new \InvalidArgumentException('La compra no tiene una reserva de stock.');
+            }
+
+            /** @var StockReservation $reservation */
+            $reservation = StockReservation::query()->lockForUpdate()->findOrFail($purchase->stock_reservation_id);
+            if ($reservation->status === StockReservation::STATUS_COMMITTED) {
+                return;
+            }
+            if ($reservation->status !== StockReservation::STATUS_ACTIVE) {
+                throw new \InvalidArgumentException('La reserva de stock no está activa.');
+            }
+            if ($reservation->expires_at !== null && ! $reservation->expires_at->isFuture()) {
+                throw new StockReservationExpiredException;
+            }
+
+            $lines = $this->lockLines($reservation);
+            if ($lines->isEmpty()) {
+                throw new \InvalidArgumentException('La reserva de stock no tiene inventarios.');
+            }
+
+            $inventories = $this->lockInventories($lines);
+            foreach ($lines as $line) {
+                $inventory = $inventories->get($line->inventory_id)
+                    ?? throw new \InvalidArgumentException('No se encontró el inventario reservado.');
+                if ($inventory->reserved_stock < $line->quantity
+                    || ($line->tracks_inventory && $inventory->real_stock < $line->quantity)) {
+                    throw new \InvalidArgumentException('La reserva de stock no alcanza para confirmar la compra.');
+                }
+            }
+
+            foreach ($lines as $line) {
+                $inventories->get($line->inventory_id)->buy(
+                    (int) $line->quantity,
+                    (bool) $line->tracks_inventory,
+                );
+            }
+
+            $reservation->update([
+                'status' => StockReservation::STATUS_COMMITTED,
+                'expires_at' => null,
+                'committed_at' => now(),
+                'released_at' => null,
+                'expired_at' => null,
+                'release_reason' => null,
+            ]);
+        });
+    }
+
+    public function releaseForPurchase(
+        Purchase $purchase,
+        string $status = StockReservation::STATUS_RELEASED,
+        ?string $reason = null,
+    ): void {
+        DB::transaction(function () use ($purchase, $status, $reason): void {
+            /** @var Purchase $purchase */
+            $purchase = Purchase::query()->lockForUpdate()->findOrFail($purchase->getKey());
+            if ($purchase->stock_reservation_id === null) {
+                return;
+            }
+
+            /** @var StockReservation|null $reservation */
+            $reservation = StockReservation::query()->lockForUpdate()->find($purchase->stock_reservation_id);
+            if ($reservation !== null) {
+                $this->finalizeLocked($reservation, $status, $reason);
            }
        });
    }

-    private function recordIncrease(CartItem $cartItem, CatalogItem|Variant $selection, int $quantity): void
+    public function returnToCart(Purchase $purchase, Cart $cart): StockReservation
    {
-        foreach ($this->inventory->requirementsFor($selection, $quantity) as $inventoryId => $requiredQuantity) {
-            $reservation = $this->lockReservation($cartItem, $inventoryId);
+        return DB::transaction(function () use ($purchase, $cart): StockReservation {
+            /** @var Purchase $purchase */
+            $purchase = Purchase::query()->lockForUpdate()->findOrFail($purchase->getKey());
+            /** @var Cart $cart */
+            $cart = Cart::query()->lockForUpdate()->findOrFail($cart->getKey());

-            if ($reservation === null) {
-                StockReservation::query()->create([
-                    'inventory_id' => $inventoryId,
-                    'cart_item_id' => $cartItem->getKey(),
-                    'quantity' => $requiredQuantity,
-                    'status' => StockReservation::STATUS_ACTIVE,
-                    'expires_at' => $this->expiration(),
-                ]);
-
-                continue;
+            if ($purchase->stock_reservation_id === null
+                || $cart->current_stock_reservation_id !== $purchase->stock_reservation_id) {
+                throw new \InvalidArgumentException('La compra y el carrito no comparten la reserva activa.');
            }

-            $reservation->update([
-                'quantity' => ($reservation->status === StockReservation::STATUS_ACTIVE ? $reservation->quantity : 0) + $requiredQuantity,
-                'status' => StockReservation::STATUS_ACTIVE,
-                'committed_at' => null,
-                'released_at' => null,
-                'expires_at' => $this->expiration(),
-            ]);
-        }
+            /** @var StockReservation $reservation */
+            $reservation = StockReservation::query()
+                ->lockForUpdate()
+                ->findOrFail($purchase->stock_reservation_id);
+            $this->assertUsableCartReservation($reservation);
+
+            $purchase->update(['stock_reservation_id' => null]);
+            $cart->update(['current_purchase_id' => null]);
+            $reservation->update(['expires_at' => $this->expiration()]);
+
+            return $reservation->fresh('lines');
+        });
    }

-    private function recordDecrease(
-        CartItem $cartItem,
-        CatalogItem|Variant $selection,
-        int $quantity,
-        string $releasedStatus,
+    public function assertCartReservationUsable(Cart $cart): void
+    {
+        DB::transaction(function () use ($cart): void {
+            /** @var Cart $cart */
+            $cart = Cart::query()->lockForUpdate()->findOrFail($cart->getKey());
+            if ($cart->current_stock_reservation_id === null) {
+                return;
+            }
+
+            /** @var StockReservation $reservation */
+            $reservation = StockReservation::query()
+                ->lockForUpdate()
+                ->findOrFail($cart->current_stock_reservation_id);
+            $this->assertUsableCartReservation($reservation);
+        });
+    }
+
+    public function releaseCurrentCartReservation(
+        Cart $cart,
+        string $reason = self::REASON_CART_CHANGED,
    ): void {
-        foreach ($this->inventory->requirementsFor($selection, $quantity) as $inventoryId => $requiredQuantity) {
-            $reservation = $this->lockReservation($cartItem, $inventoryId);
-            if ($reservation === null || $reservation->status !== StockReservation::STATUS_ACTIVE || $reservation->quantity < $requiredQuantity) {
-                throw new \InvalidArgumentException('La reserva de stock no alcanza para liberar la cantidad solicitada.');
+        DB::transaction(function () use ($cart, $reason): void {
+            /** @var Cart $cart */
+            $cart = Cart::query()->lockForUpdate()->findOrFail($cart->getKey());
+            if ($cart->current_stock_reservation_id === null) {
+                return;
            }

-            $remaining = $reservation->quantity - $requiredQuantity;
-            $reservation->update([
-                'quantity' => $remaining,
-                'status' => $remaining === 0 ? $releasedStatus : StockReservation::STATUS_ACTIVE,
-                'released_at' => $remaining === 0 ? now() : null,
-                'expires_at' => $remaining === 0 ? null : $reservation->expires_at,
-            ]);
+            /** @var StockReservation|null $reservation */
+            $reservation = StockReservation::query()->lockForUpdate()->find($cart->current_stock_reservation_id);
+            if ($reservation !== null) {
+                $this->finalizeLocked($reservation, StockReservation::STATUS_RELEASED, $reason);
+            }
+            $cart->update(['current_stock_reservation_id' => null]);
+        });
+    }
+
+    public function expire(StockReservation $reservation): void
+    {
+        DB::transaction(function () use ($reservation): void {
+            /** @var StockReservation $reservation */
+            $reservation = StockReservation::query()->lockForUpdate()->findOrFail($reservation->getKey());
+            if ($reservation->status !== StockReservation::STATUS_ACTIVE
+                || $reservation->expires_at === null
+                || $reservation->expires_at->isFuture()) {
+                return;
+            }
+
+            $this->finalizeLocked($reservation, StockReservation::STATUS_EXPIRED, null);
+        });
+    }
+
+    public function clearExpirationForReview(Purchase $purchase): void
+    {
+        DB::transaction(function () use ($purchase): void {
+            /** @var Purchase $purchase */
+            $purchase = Purchase::query()->lockForUpdate()->findOrFail($purchase->getKey());
+            if ($purchase->stock_reservation_id === null) {
+                throw new \InvalidArgumentException('La compra no tiene una reserva de stock.');
+            }
+
+            /** @var StockReservation $reservation */
+            $reservation = StockReservation::query()
+                ->lockForUpdate()
+                ->findOrFail($purchase->stock_reservation_id);
+            if ($reservation->status !== StockReservation::STATUS_ACTIVE) {
+                throw new \InvalidArgumentException('La reserva de stock no está activa.');
+            }
+            if ($reservation->expires_at !== null && ! $reservation->expires_at->isFuture()) {
+                throw new StockReservationExpiredException;
+            }
+
+            $reservation->update(['expires_at' => null]);
+        });
+    }
+
+    /**
+     * @param  Collection<int, CartItem>  $items
+     * @return array<int, array{quantity: int, tracks_inventory: bool}>
+     */
+    private function requirementsForItems(Collection $items): array
+    {
+        $requirements = [];
+        foreach ($items as $item) {
+            $selection = $item->selectedItem();
+            if ($selection === null) {
+                throw new \InvalidArgumentException('El carrito contiene un item de catálogo inexistente.');
+            }
+
+            foreach ($this->inventory->detailedRequirementsFor($selection, (int) $item->cantidad) as $inventoryId => $requirement) {
+                if (isset($requirements[$inventoryId])) {
+                    $requirements[$inventoryId]['quantity'] += $requirement['quantity'];
+                    $requirements[$inventoryId]['tracks_inventory'] =
+                        $requirements[$inventoryId]['tracks_inventory'] || $requirement['tracks_inventory'];
+
+                    continue;
+                }
+
+                $requirements[$inventoryId] = $requirement;
+            }
+        }
+
+        ksort($requirements);
+
+        return $requirements;
+    }
+
+    /** @param Collection<int, CartItem> $items */
+    private function loadSelections(Collection $items): void
+    {
+        $items->load([
+            'catalogItem.inventory',
+            'catalogItem.bundleComponents.catalogItem.inventory',
+            'catalogItem.bundleComponents.variant.inventory',
+            'catalogItem.bundleComponents.variant.catalogItem',
+            'variant.inventory',
+            'variant.catalogItem',
+        ]);
+    }
+
+    /** @return Collection<int, StockReservationLine> */
+    private function lockLines(StockReservation $reservation): Collection
+    {
+        return StockReservationLine::query()
+            ->where('stock_reservation_id', $reservation->getKey())
+            ->orderBy('inventory_id')
+            ->lockForUpdate()
+            ->get();
+    }
+
+    /**
+     * @param  Collection<int, StockReservationLine>  $lines
+     * @return Collection<int, Inventory>
+     */
+    private function lockInventories(Collection $lines): Collection
+    {
+        return Inventory::query()
+            ->whereKey($lines->pluck('inventory_id'))
+            ->orderBy('id')
+            ->lockForUpdate()
+            ->get()
+            ->keyBy('id');
+    }
+
+    private function finalizeLocked(
+        StockReservation $reservation,
+        string $status,
+        ?string $reason,
+    ): void {
+        if ($reservation->status !== StockReservation::STATUS_ACTIVE) {
+            return;
+        }
+        if (! in_array($status, [StockReservation::STATUS_RELEASED, StockReservation::STATUS_EXPIRED], true)) {
+            throw new \InvalidArgumentException('El estado final de la reserva no es válido.');
+        }
+
+        $lines = $this->lockLines($reservation);
+        $inventories = $this->lockInventories($lines);
+        foreach ($lines as $line) {
+            $inventory = $inventories->get($line->inventory_id)
+                ?? throw new \InvalidArgumentException('No se encontró el inventario reservado.');
+            $inventory->release((int) $line->quantity);
+        }
+
+        $now = now();
+        $reservation->update([
+            'status' => $status,
+            'expires_at' => null,
+            'released_at' => $status === StockReservation::STATUS_RELEASED ? $now : null,
+            'expired_at' => $status === StockReservation::STATUS_EXPIRED ? $now : null,
+            'release_reason' => $status === StockReservation::STATUS_RELEASED ? $reason : null,
+        ]);
+
+        if ($status === StockReservation::STATUS_RELEASED) {
+            Cart::query()
+                ->where('current_stock_reservation_id', $reservation->getKey())
+                ->update(['current_stock_reservation_id' => null]);
        }
    }

-    private function lockReservation(CartItem $cartItem, int $inventoryId): ?StockReservation
+    private function assertUsableCartReservation(StockReservation $reservation): void
    {
-        return StockReservation::query()
-            ->where('cart_item_id', $cartItem->getKey())
-            ->where('inventory_id', $inventoryId)
-            ->lockForUpdate()
-            ->first();
+        if ($reservation->status === StockReservation::STATUS_EXPIRED
+            || ($reservation->expires_at !== null && ! $reservation->expires_at->isFuture())) {
+            throw new StockReservationExpiredException;
+        }
+
+        if ($reservation->status !== StockReservation::STATUS_ACTIVE
+            || $reservation->expires_at === null) {
+            throw new \InvalidArgumentException('La reserva de stock no está disponible para operar el carrito.');
+        }
    }

    private function expiration(): Carbon
--- a/app/Domains/Catalog/documentacion/README.md
+++ b/app/Domains/Catalog/documentacion/README.md
@@ -9,7 +9,7 @@ Modela y publica la oferta comercial del tenant: productos, variantes, categorí
 - `CatalogItem` es la raíz del producto y se relaciona con tenant, categoría, marca, inventario, variantes, atributos, adjuntos y grupos destacados.
 - `Variant`, `ItemAttribute`, `Attribute`, `AttributeOption` y `VariantDefinition` describen opciones comercializables.
 - `Inventory` administra stock disponible, reservado y comprado.
- `StockReservation` atribuye cada unidad reservada a un ítem de carrito y, durante checkout, a una compra, con estados `active`, `committed`, `released` y `expired`.
+- `StockReservation` representa la reserva completa de un carrito o checkout, con estados `active`, `committed`, `released` y `expired`. Su `expires_at` es el único reloj del bloqueo. Al expirar, también pasan a `expired` la compra pagable y el carrito asociados dentro de la misma transacción. Sus estados terminales nunca se reactivan ni se reemplazan implícitamente. Sus `StockReservationLine` agregan la cantidad requerida por inventario, incluso cuando varios ítems o bundles consumen el mismo stock.
 - `Category` soporta jerarquía y categorías globales o propias del tenant.
 - `FeaturedGroup` y `FeaturedItem` organizan secciones destacadas.
 - `BundleComponent` representa los componentes de un paquete.
@@ -18,7 +18,8 @@ Modela y publica la oferta comercial del tenant: productos, variantes, categorí

 - `CatalogService`: alta, búsqueda, detalle, listado por categoría y eliminación.
 - `CatalogInventoryService`: consulta, reserva, libera y confirma inventario.
- `StockReservationService`: mantiene el ledger de reservas sincronizado con `Inventory.reserved_stock`.
+- `StockReservationService`: sincroniza el carrito como conjunto, bloquea todos sus inventarios en orden estable y mantiene el ledger agregado consistente con `Inventory.reserved_stock`.
+- `ExpireStockReservationsService`: detecta en un único recorrido reservas vencidas de compras, carritos y huérfanas, y delega los efectos comerciales sin mezclar esas reglas con la liberación física del inventario.
 - `FeaturedGroupService`: pagina los ítems destacados para la tienda.
 - `OnTicketFeaturedGroupService`: administra grupos destacados del panel para sitios de tickets.

--- a/app/Domains/Desfile/Services/InvitationPurchaseProvisioner.php
+++ b/app/Domains/Desfile/Services/InvitationPurchaseProvisioner.php
@@ -22,7 +22,7 @@ class InvitationPurchaseProvisioner
    private const ALLOCATIONS = [
        ['sector' => 'A', 'row' => 1, 'first_seat' => 1, 'last_seat' => 16, 'type' => 'NORMAL'],
        ['sector' => 'A', 'row' => 3, 'first_seat' => 1, 'last_seat' => 14, 'type' => 'NORMAL'],
-        ['sector' => 'C', 'row' => 1, 'first_seat' => 1, 'last_seat' => 17, 'type' => 'VIP + LUNCH'],
+        ['sector' => 'C', 'row' => 1, 'first_seat' => 1, 'last_seat' => 16, 'type' => 'VIP + LUNCH'],
        ['sector' => 'C', 'row' => 3, 'first_seat' => 6, 'last_seat' => 7, 'type' => 'NORMAL'],
    ];

@@ -144,7 +144,6 @@ class InvitationPurchaseProvisioner
        if ($purchaseId !== null) {
            DB::table('compras')->where('id', $purchaseId)->update([
                'status' => 'paid',
-                'expires_at' => null,
                'total' => 0,
                'updated_at' => $now,
            ]);
@@ -158,7 +157,6 @@ class InvitationPurchaseProvisioner
            'cart_id' => null,
            'status' => 'paid',
            'payment_method' => self::PAYMENT_METHOD,
-            'expires_at' => null,
            'total' => 0,
            'dni' => null,
            'transfer_payer_dni' => null,
@@ -392,15 +390,27 @@ class InvitationPurchaseProvisioner
            'sold_units' => $inventory->sold_units + 1,
        ]);

-        DB::table('stock_reservations')->insert([
+        $reservationId = DB::table('compras')->where('id', $purchaseId)->value('stock_reservation_id');
+        if ($reservationId === null) {
+            $reservationId = DB::table('stock_reservations')->insertGetId([
+                'status' => 'committed',
+                'committed_at' => $now,
+                'released_at' => null,
+                'expired_at' => null,
+                'release_reason' => null,
+                'created_at' => $now,
+                'updated_at' => $now,
+            ]);
+            DB::table('compras')->where('id', $purchaseId)->update([
+                'stock_reservation_id' => $reservationId,
+            ]);
+        }
+
+        DB::table('stock_reservation_lines')->insert([
+            'stock_reservation_id' => $reservationId,
            'inventory_id' => $inventory->id,
-            'cart_item_id' => null,
-            'purchase_id' => $purchaseId,
            'quantity' => 1,
-            'status' => 'committed',
-            'expires_at' => null,
-            'committed_at' => $now,
-            'released_at' => null,
+            'tracks_inventory' => true,
            'created_at' => $now,
            'updated_at' => $now,
        ]);
--- a/app/Domains/Integration/Services/TelepagosWebhookService.php
+++ b/app/Domains/Integration/Services/TelepagosWebhookService.php
@@ -7,7 +7,10 @@ use App\Domains\Purchase\Models\Purchase;
 use App\Domains\Purchase\Models\TelepagosPayment;
 use App\Domains\Purchase\Models\TelepagosQr;
 use App\Domains\Purchase\Services\CheckoutService;
+use App\Domains\Purchase\Services\DniDistanceService;
 use Exception;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Collection;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Log;

@@ -15,6 +18,7 @@ class TelepagosWebhookService
 {
    public function __construct(
        private readonly CheckoutService $checkoutService,
+        private readonly DniDistanceService $dniDistance,
    ) {}

    /**
@@ -41,7 +45,6 @@ class TelepagosWebhookService

            $paymentData = [
                'compra_id' => null,
-                'matched_purchase_ids' => null,
                'cuit_buyer' => $details['data']['buyer']['cuit'] ?? $details['buyer']['cuit'] ?? null,
                'cvu_buyer' => $details['data']['buyer']['cvu'] ?? $details['buyer']['cvu'] ?? null,
                'amount' => $amount,
@@ -73,24 +76,55 @@ class TelepagosWebhookService
                $dni = substr($cuit, 2, -1);

                $tenantCodes = $client->tenants()->pluck('codigo');
-                $purchases = Purchase::whereIn('tenant_codigo', $tenantCodes)
-                    ->where('transfer_payer_dni', $dni)
+                $eligiblePurchases = Purchase::query()
+                    ->whereIn('tenant_codigo', $tenantCodes)
                    ->whereIn('status', [
                        Purchase::STATUS_CREATED,
                        Purchase::STATUS_PENDING_PAYMENT,
                        Purchase::STATUS_IN_REVIEW,
                    ])
-                    ->where('payment_method', 'transfer')
+                    ->where('payment_method', 'transfer');
+
+                $purchases = (clone $eligiblePurchases)
                    ->where('total', $amount)
                    ->latest()
-                    ->get();
+                    ->get()
+                    ->filter(fn (Purchase $purchase): bool => $purchase->transfer_payer_dni !== null
+                        && $this->dniDistance->distance($dni, $purchase->transfer_payer_dni) === 0)
+                    ->values();

-                $paymentData['matched_purchase_ids'] = $purchases->pluck('id')->all();
                $compra = $purchases->count() === 1 ? $purchases->first() : null;

                if (! $compra) {
-                    if ($purchases->count() > 1) {
-                        TelepagosPayment::create($paymentData);
+                    $candidatePurchases = $this->findTransferCandidates(
+                        $eligiblePurchases,
+                        $dni,
+                        $amount,
+                    );
+                    if ($candidatePurchases->isNotEmpty()) {
+                        $payment = $this->storeTransferCandidates(
+                            $paymentData,
+                            $candidatePurchases,
+                            $dni,
+                            $amount,
+                        );
+
+                        Log::channel('telepagos')->info('Telepagos webhook: Transfer payment candidates found.', [
+                            'client_code' => $client->code,
+                            'cashin_id' => $cashinId,
+                            'telepagos_payment_id' => $payment->id,
+                            'amount' => $amount,
+                            'candidate_count' => $payment->candidates->count(),
+                            'candidates' => $payment->candidates
+                                ->map(fn ($candidate): array => [
+                                    'purchase_id' => $candidate->compra_id,
+                                    'match_reason' => $candidate->match_reason,
+                                    'dni_distance' => $candidate->dni_distance,
+                                    'amount_difference' => $candidate->amount_difference,
+                                    'confidence' => $candidate->confidence,
+                                ])
+                                ->all(),
+                        ]);
                    }

                    Log::channel('telepagos')->warning('Telepagos webhook: Expected exactly one matching purchase.', [
@@ -209,4 +243,91 @@ class TelepagosWebhookService
    {
        return number_format((float) $amount, 2, '.', '');
    }
+
+    /**
+     * @param  Builder<Purchase>  $eligiblePurchases
+     * @return Collection<int, Purchase>
+     */
+    private function findTransferCandidates(Builder $eligiblePurchases, string $dni, string $amount): Collection
+    {
+        $tolerancePercentage = max(
+            0,
+            (float) config('purchase.transfer_candidate_amount_tolerance_percentage', 5),
+        );
+        $numericAmount = (float) $amount;
+        $tolerance = $numericAmount * ($tolerancePercentage / 100);
+        $minimumAmount = $this->normalizeAmount(max(0, $numericAmount - $tolerance));
+        $maximumAmount = $this->normalizeAmount($numericAmount + $tolerance);
+
+        return (clone $eligiblePurchases)
+            ->whereBetween('total', [$minimumAmount, $maximumAmount])
+            ->latest()
+            ->get()
+            ->filter(function (Purchase $purchase) use ($dni, $amount): bool {
+                if ($purchase->transfer_payer_dni === null) {
+                    return false;
+                }
+
+                $purchaseAmount = $this->normalizeAmount($purchase->total);
+                $distance = $this->dniDistance->distance(
+                    $dni,
+                    (string) $purchase->transfer_payer_dni,
+                );
+
+                return $distance === 0
+                    || ($purchaseAmount === $amount && $distance <= 2);
+            })
+            ->values();
+    }
+
+    /**
+     * @param  array<string, mixed>  $paymentData
+     * @param  Collection<int, Purchase>  $candidatePurchases
+     */
+    private function storeTransferCandidates(
+        array $paymentData,
+        Collection $candidatePurchases,
+        string $dni,
+        string $amount,
+    ): TelepagosPayment {
+        return DB::transaction(function () use ($paymentData, $candidatePurchases, $dni, $amount): TelepagosPayment {
+            $payment = TelepagosPayment::create($paymentData);
+
+            $payment->candidates()->createMany(
+                $candidatePurchases
+                    ->map(function (Purchase $purchase) use ($dni, $amount): array {
+                        $purchaseAmount = $this->normalizeAmount($purchase->total);
+                        $dniDistance = $this->dniDistance->distance(
+                            $dni,
+                            (string) $purchase->transfer_payer_dni,
+                        );
+                        $dniMatches = $dniDistance === 0;
+                        $amountMatches = $purchaseAmount === $amount;
+
+                        return [
+                            'compra_id' => $purchase->id,
+                            'dni_matches' => $dniMatches,
+                            'dni_distance' => $dniDistance,
+                            'payment_dni' => $dni,
+                            'purchase_dni' => $purchase->transfer_payer_dni,
+                            'amount_matches' => $amountMatches,
+                            'payment_amount' => $amount,
+                            'purchase_amount' => $purchaseAmount,
+                            'amount_difference' => $this->normalizeAmount(
+                                abs((float) $purchaseAmount - (float) $amount),
+                            ),
+                            'match_reason' => $amountMatches
+                                ? ($dniMatches ? 'ambiguous_exact_match' : 'exact_amount_near_dni')
+                                : 'exact_dni_near_amount',
+                            'confidence' => $amountMatches
+                                ? ($dniMatches ? 'exact' : 'medium')
+                                : 'high',
+                        ];
+                    })
+                    ->all(),
+            );
+
+            return $payment->load('candidates');
+        });
+    }
 }
--- a/app/Domains/Purchase/Controllers/PurchaseController.php
+++ b/app/Domains/Purchase/Controllers/PurchaseController.php
@@ -36,6 +36,7 @@ class PurchaseController extends Controller

        return PurchaseResource::collection(
            Purchase::query()
+                ->with('stockReservation')
                ->where('tenant_codigo', $tenant->codigo)
                ->where('user_id', $request->user()->id)
                ->when($statuses !== [], fn ($query) => $query->whereIn('status', $statuses))
@@ -92,7 +93,6 @@ class PurchaseController extends Controller
        PaymentIntentRequest $request,
        Tenant $tenant,
        Purchase $compra,
-        CheckoutService $checkoutService,
        PurchaseStateGuard $purchaseState,
    ): JsonResponse {
        $compra = $this->resolveScopedPurchase($tenant, $request->user()->id, $compra);
@@ -101,7 +101,12 @@ class PurchaseController extends Controller
            ? preg_replace('/\D+/', '', (string) $request->validated('transfer_payer_dni'))
            : null;

-        $updated = DB::transaction(function () use ($compra, $method, $purchaseState, $transferPayerDni): bool {
+        $updated = DB::transaction(function () use (
+            $compra,
+            $method,
+            $purchaseState,
+            $transferPayerDni,
+        ): bool {
            /** @var Purchase|null $purchase */
            $purchase = Purchase::query()
                ->whereKey($compra->getKey())
@@ -128,9 +133,6 @@ class PurchaseController extends Controller
            $purchaseUpdate = [
                'payment_method' => $method,
                'status' => Purchase::STATUS_PENDING_PAYMENT,
-                'expires_at' => now()->addMinutes(
-                    max(1, (int) config("purchase.payment_expiration_minutes.{$method}", 30))
-                ),
                'total' => $purchase->calculateCurrentTotalAmount(),
            ];

@@ -150,7 +152,6 @@ class PurchaseController extends Controller

        $compra->refresh();
        $totalAmount = (float) $compra->total;
-        $checkoutService->syncReservationExpiration($compra);

        if ($method === 'transfer') {
            $telepagosService = new TelepagosIntegrationService;
--- a/app/Domains/Purchase/Models/Purchase.php
+++ b/app/Domains/Purchase/Models/Purchase.php
@@ -19,11 +19,11 @@ use Illuminate\Support\Facades\DB;

 #[Fillable([
    'cart_id',
+    'stock_reservation_id',
    'tenant_codigo',
    'user_id',
    'status',
    'payment_method',
-    'expires_at',
    'total',
    'dni',
    'transfer_payer_dni',
@@ -77,8 +77,8 @@ class Purchase extends Model
    {
        return [
            'cart_id' => 'integer',
+            'stock_reservation_id' => 'integer',
            'user_id' => 'integer',
-            'expires_at' => 'datetime',
            'total' => 'decimal:2',
        ];
    }
@@ -123,10 +123,10 @@ class Purchase extends Model
        return $this->hasMany(Ticket::class, 'source_purchase_id');
    }

-    /** @return HasMany<StockReservation, $this> */
-    public function stockReservations(): HasMany
+    /** @return BelongsTo<StockReservation, $this> */
+    public function stockReservation(): BelongsTo
    {
-        return $this->hasMany(StockReservation::class);
+        return $this->belongsTo(StockReservation::class);
    }

    /**
@@ -145,6 +145,12 @@ class Purchase extends Model
        return $this->hasMany(TelepagosPayment::class, 'compra_id');
    }

+    /** @return HasMany<TelepagosPaymentCandidate, $this> */
+    public function telepagosPaymentCandidates(): HasMany
+    {
+        return $this->hasMany(TelepagosPaymentCandidate::class, 'compra_id');
+    }
+
    public function getTotalAmount(): float
    {
        if ($this->total !== null) {
--- a/app/Domains/Purchase/Models/TelepagosPayment.php
+++ b/app/Domains/Purchase/Models/TelepagosPayment.php
@@ -6,10 +6,10 @@ use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;

 #[Fillable([
    'compra_id',
-    'matched_purchase_ids',
    'cuit_buyer',
    'cvu_buyer',
    'amount',
@@ -30,7 +30,6 @@ class TelepagosPayment extends Model
    {
        return [
            'compra_id' => 'integer',
-            'matched_purchase_ids' => 'array',
            'amount' => 'decimal:2',
        ];
    }
@@ -42,4 +41,10 @@ class TelepagosPayment extends Model
    {
        return $this->belongsTo(Purchase::class, 'compra_id');
    }
+
+    /** @return HasMany<TelepagosPaymentCandidate, $this> */
+    public function candidates(): HasMany
+    {
+        return $this->hasMany(TelepagosPaymentCandidate::class, 'telepagos_payment_id');
+    }
 }
--- a/app/Domains/Purchase/Models/TelepagosPaymentCandidate.php
+++ b/app/Domains/Purchase/Models/TelepagosPaymentCandidate.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Domains\Purchase\Models;
+
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+#[Fillable([
+    'telepagos_payment_id',
+    'compra_id',
+    'dni_matches',
+    'dni_distance',
+    'payment_dni',
+    'purchase_dni',
+    'amount_matches',
+    'payment_amount',
+    'purchase_amount',
+    'amount_difference',
+    'match_reason',
+    'confidence',
+])]
+class TelepagosPaymentCandidate extends Model
+{
+    protected $table = 'telepagos_payment_candidates';
+
+    protected function casts(): array
+    {
+        return [
+            'telepagos_payment_id' => 'integer',
+            'compra_id' => 'integer',
+            'dni_matches' => 'boolean',
+            'dni_distance' => 'integer',
+            'amount_matches' => 'boolean',
+            'payment_amount' => 'decimal:2',
+            'purchase_amount' => 'decimal:2',
+            'amount_difference' => 'decimal:2',
+        ];
+    }
+
+    public function payment(): BelongsTo
+    {
+        return $this->belongsTo(TelepagosPayment::class, 'telepagos_payment_id');
+    }
+
+    public function purchase(): BelongsTo
+    {
+        return $this->belongsTo(Purchase::class, 'compra_id');
+    }
+}
--- a/app/Domains/Purchase/Resources/PurchaseResource.php
+++ b/app/Domains/Purchase/Resources/PurchaseResource.php
@@ -4,6 +4,7 @@ namespace App\Domains\Purchase\Resources;

 use App\Domains\Purchase\Models\Purchase;
 use App\Domains\Purchase\Models\PurchaseItem;
+use App\Domains\Purchase\Models\TelepagosPaymentCandidate;
 use Illuminate\Http\Request;
 use Illuminate\Http\Resources\Json\JsonResource;

@@ -17,12 +18,15 @@ class PurchaseResource extends JsonResource
     */
    public function toArray(Request $request): array
    {
+        $serverTime = now();
+        $expiresAt = $this->stockReservation?->expires_at;
        $items = $this->resource->relationLoaded('items')
            ? $this->resource->getRelation('items')
            : collect();
        $ticketsCount = array_key_exists('tickets_count', $this->resource->getAttributes())
            ? (int) $this->resource->getAttribute('tickets_count')
            : null;
+        $paymentVerification = $this->resolvePaymentVerification();

        $subtotal = $items->isNotEmpty()
            ? $items->reduce(
@@ -48,7 +52,11 @@ class PurchaseResource extends JsonResource
            'created_at' => $this->created_at,
            'status' => $this->status,
            'payment_method' => $this->payment_method,
-            'expires_at' => $this->expires_at,
+            'expires_at' => $expiresAt,
+            'expires_in_seconds' => $expiresAt === null
+                ? null
+                : max(0, $expiresAt->getTimestamp() - $serverTime->getTimestamp()),
+            'server_time' => $serverTime,
            'dni' => $this->dni,
            'transfer_payer_dni' => $this->transfer_payer_dni,
            'telefono' => $this->telefono,
@@ -58,6 +66,7 @@ class PurchaseResource extends JsonResource
            'items' => PurchaseItemResource::collection($items),
            'tickets_count' => $this->when($ticketsCount !== null, $ticketsCount),
            'has_generated_tickets' => $this->when($ticketsCount !== null, $ticketsCount > 0),
+            'payment_verification' => $this->when($paymentVerification !== null, $paymentVerification),
            'subtotal' => $this->formatMoney($subtotal),
            'total' => $this->formatMoney($total),
        ];
@@ -77,4 +86,75 @@ class PurchaseResource extends JsonResource
    {
        return number_format((float) ($amount ?? 0), 2, '.', '');
    }
+
+    /** @return array<string, mixed>|null */
+    private function resolvePaymentVerification(): ?array
+    {
+        if (
+            $this->status !== Purchase::STATUS_IN_REVIEW
+            || $this->payment_method !== 'transfer'
+            || ! $this->resource->relationLoaded('telepagosPaymentCandidates')
+        ) {
+            return null;
+        }
+
+        $candidates = $this->resource
+            ->getRelation('telepagosPaymentCandidates')
+            ->sort(fn (TelepagosPaymentCandidate $left, TelepagosPaymentCandidate $right): int => $this->comparePaymentCandidates($left, $right))
+            ->values();
+        /** @var TelepagosPaymentCandidate|null $primary */
+        $primary = $candidates->first();
+
+        return [
+            'status' => $primary === null ? 'pending' : 'candidate',
+            'candidate_count' => $candidates->count(),
+            'primary' => $primary === null ? null : [
+                'reason' => $primary->match_reason,
+                'dni_distance' => $primary->dni_distance,
+                'payment_amount' => $this->formatMoney($primary->payment_amount),
+                'purchase_amount' => $this->formatMoney($primary->purchase_amount),
+                'amount_difference' => $this->formatMoney($primary->amount_difference),
+                'confidence' => $primary->confidence,
+                'detected_at' => $primary->payment?->created_at?->toIso8601String(),
+            ],
+            'reasons' => $candidates
+                ->pluck('match_reason')
+                ->unique()
+                ->values()
+                ->all(),
+        ];
+    }
+
+    private function comparePaymentCandidates(
+        TelepagosPaymentCandidate $left,
+        TelepagosPaymentCandidate $right,
+    ): int {
+        $reasonComparison = $this->paymentCandidateRank($left->match_reason)
+            <=> $this->paymentCandidateRank($right->match_reason);
+
+        if ($reasonComparison !== 0) {
+            return $reasonComparison;
+        }
+
+        $differenceComparison = (float) $left->amount_difference <=> (float) $right->amount_difference;
+
+        if ($differenceComparison !== 0) {
+            return $differenceComparison;
+        }
+
+        $leftTimestamp = $left->payment?->created_at?->getTimestamp() ?? 0;
+        $rightTimestamp = $right->payment?->created_at?->getTimestamp() ?? 0;
+
+        return ($rightTimestamp <=> $leftTimestamp) ?: ($right->id <=> $left->id);
+    }
+
+    private function paymentCandidateRank(string $reason): int
+    {
+        return match ($reason) {
+            'ambiguous_exact_match' => 0,
+            'exact_dni_near_amount' => 1,
+            'exact_amount_near_dni' => 2,
+            default => 3,
+        };
+    }
 }
--- a/app/Domains/Purchase/Services/Checkout/CompleteCheckoutService.php
+++ b/app/Domains/Purchase/Services/Checkout/CompleteCheckoutService.php
@@ -61,10 +61,7 @@ class CompleteCheckoutService

            $this->purchaseState->lockCurrentCart($purchase);

-            if (
-                $purchase->status !== Purchase::STATUS_PENDING_PAYMENT
-                || ($purchase->expires_at !== null && $purchase->expires_at->isPast())
-            ) {
+            if ($purchase->status !== Purchase::STATUS_PENDING_PAYMENT) {
                throw ValidationException::withMessages([
                    'purchase' => __('api.purchase.not_available_for_review'),
                ]);
@@ -72,9 +69,8 @@ class CompleteCheckoutService

            $purchase->update([
                'status' => Purchase::STATUS_IN_REVIEW,
-                'expires_at' => null,
            ]);
-            $this->reservations->syncPurchaseExpiration($purchase);
+            $this->reservations->clearExpirationForReview($purchase);

            return $this->loadPurchase($purchase);
        });
@@ -161,13 +157,14 @@ class CompleteCheckoutService
                    ]);
                }

-                try {
-                    $this->reservations->commit($cartItem, $selection, $purchase);
-                } catch (\InvalidArgumentException) {
-                    throw ValidationException::withMessages([
-                        'items' => __('api.purchase.inconsistent_reservation'),
-                    ]);
-                }
+            }
+
+            try {
+                $this->reservations->commit($purchase);
+            } catch (\InvalidArgumentException) {
+                throw ValidationException::withMessages([
+                    'items' => __('api.purchase.inconsistent_reservation'),
+                ]);
            }

            $this->sourceCart->finalize($purchase);
@@ -194,7 +191,7 @@ class CompleteCheckoutService

    private function loadPurchase(Purchase $purchase): Purchase
    {
-        return $purchase->load(['items.imageAttachment']);
+        return $purchase->load(['items.imageAttachment', 'stockReservation']);
    }

    private function itemKey(int $catalogItemId, ?int $variantId): string
--- a/app/Domains/Purchase/Services/Checkout/PurchaseResponseLoader.php
+++ b/app/Domains/Purchase/Services/Checkout/PurchaseResponseLoader.php
@@ -8,6 +8,15 @@ class PurchaseResponseLoader
 {
    public function load(Purchase $purchase): Purchase
    {
-        return $purchase->load(['tenant', 'items.imageAttachment']);
+        $relations = ['tenant', 'items.imageAttachment', 'stockReservation'];
+
+        if (
+            $purchase->status === Purchase::STATUS_IN_REVIEW
+            && $purchase->payment_method === 'transfer'
+        ) {
+            $relations[] = 'telepagosPaymentCandidates.payment';
+        }
+
+        return $purchase->load($relations);
    }
 }
--- a/app/Domains/Purchase/Services/Checkout/ReleaseCheckoutService.php
+++ b/app/Domains/Purchase/Services/Checkout/ReleaseCheckoutService.php
@@ -5,11 +5,10 @@ namespace App\Domains\Purchase\Services\Checkout;
 use App\Domains\Cart\Models\Cart;
 use App\Domains\Catalog\Models\StockReservation;
 use App\Domains\Catalog\Services\StockReservationService;
+use App\Domains\Purchase\Exceptions\PurchaseExpiredException;
 use App\Domains\Purchase\Models\Purchase;
 use Illuminate\Support\Facades\DB;
-use Illuminate\Support\Facades\Log;
 use Illuminate\Validation\ValidationException;
-use Throwable;

 class ReleaseCheckoutService
 {
@@ -32,40 +31,6 @@ class ReleaseCheckoutService
        return $this->release($purchase, Purchase::STATUS_EXPIRED);
    }

-    public function expireOverdue(): int
-    {
-        $expiredCount = 0;
-
-        Purchase::query()
-            ->whereIn('status', [Purchase::STATUS_CREATED, Purchase::STATUS_PENDING_PAYMENT])
-            ->whereNotNull('expires_at')
-            ->where('expires_at', '<=', now())
-            ->orderBy('id')
-            ->eachById(function (Purchase $purchase) use (&$expiredCount): void {
-                try {
-                    $purchase = $this->expire($purchase);
-                } catch (Throwable $exception) {
-                    Log::channel('commands')->error('Failed to expire overdue purchase.', [
-                        'command' => 'reservations:expire',
-                        'purchase_id' => $purchase->getKey(),
-                        'tenant_codigo' => $purchase->tenant_codigo,
-                        'cart_id' => $purchase->cart_id,
-                        'status' => $purchase->status,
-                        'expires_at' => $purchase->expires_at,
-                        'exception' => $exception,
-                    ]);
-
-                    return;
-                }
-
-                if ($purchase->status === Purchase::STATUS_EXPIRED) {
-                    $expiredCount++;
-                }
-            });
-
-        return $expiredCount;
-    }
-
    private function release(
        Purchase $purchase,
        string $targetStatus,
@@ -78,6 +43,11 @@ class ReleaseCheckoutService
        ): Purchase {
            $purchase = $this->lockPurchase($purchase);

+            if ($purchase->status === Purchase::STATUS_EXPIRED
+                && $targetStatus !== Purchase::STATUS_EXPIRED) {
+                throw new PurchaseExpiredException;
+            }
+
            if ($purchase->status === Purchase::STATUS_PAID) {
                if ($targetStatus === Purchase::STATUS_EXPIRED) {
                    return $this->loadPurchase($purchase);
@@ -100,14 +70,31 @@ class ReleaseCheckoutService
                return $this->loadPurchase($purchase);
            }

+            $cart = $purchase->cart()->withTrashed()->lockForUpdate()->first();
+
+            if ($targetStatus === Purchase::STATUS_CANCELLED
+                && $cart?->status === 'active'
+                && in_array($purchase->status, [
+                    Purchase::STATUS_CREATED,
+                    Purchase::STATUS_PENDING_PAYMENT,
+                ], true)) {
+                $this->reservations->returnToCart($purchase, $cart);
+                $purchase->update(['status' => Purchase::STATUS_CANCELLED]);
+
+                return $this->loadPurchase($purchase);
+            }
+
            if (
                $targetStatus === Purchase::STATUS_EXPIRED
-                && ($purchase->expires_at === null || $purchase->expires_at->isFuture())
+                && (! in_array($purchase->status, [
+                    Purchase::STATUS_CREATED,
+                    Purchase::STATUS_PENDING_PAYMENT,
+                ], true) || ! $this->hasOverdueActiveReservation($purchase))
            ) {
                return $this->loadPurchase($purchase);
            }

-            $this->releasePurchaseReservations($purchase, $targetStatus);
+            $this->releasePurchaseReservations($purchase, $targetStatus, $cart);

            $purchase->update(['status' => $targetStatus]);

@@ -115,60 +102,67 @@ class ReleaseCheckoutService
        });
    }

-    private function releasePurchaseReservations(Purchase $purchase, string $targetStatus): void
-    {
-        $cart = $purchase->cart()->withTrashed()->lockForUpdate()->first();
+    private function releasePurchaseReservations(
+        Purchase $purchase,
+        string $targetStatus,
+        ?Cart $cart,
+    ): void {
+        try {
+            $this->reservations->releaseForPurchase(
+                $purchase,
+                $targetStatus === Purchase::STATUS_EXPIRED
+                    ? StockReservation::STATUS_EXPIRED
+                    : StockReservation::STATUS_RELEASED,
+                $targetStatus === Purchase::STATUS_CANCELLED
+                    ? StockReservationService::REASON_PURCHASE_CANCELLED
+                    : ($targetStatus === Purchase::STATUS_REJECTED
+                        ? StockReservationService::REASON_PAYMENT_REJECTED
+                        : null),
+            );
+        } catch (\InvalidArgumentException) {
+            throw ValidationException::withMessages([
+                'items' => __('api.purchase.inconsistent_reservation'),
+            ]);
+        }
+
        if ($cart === null) {
            return;
        }

-        if ($cart->status === 'active') {
-            $this->reservations->detachFromPurchase($purchase);
+        if ($targetStatus === Purchase::STATUS_EXPIRED
+            && in_array($cart->status, [Cart::STATUS_ACTIVE, Cart::STATUS_CHECKOUT], true)) {
            Cart::query()
                ->whereKey($cart->getKey())
                ->where('current_purchase_id', $purchase->getKey())
-                ->update(['current_purchase_id' => null]);
-
-            return;
-        }
-
-        if ($cart->status !== 'checkout') {
-            return;
-        }
-
-        $cartItems = $cart->items()->orderBy('id')->lockForUpdate()->get();
-        $cartItems->load([
-            'catalogItem.inventory',
-            'catalogItem.bundleComponents.catalogItem.inventory',
-            'catalogItem.bundleComponents.variant.inventory',
-            'variant.inventory',
-            'variant.catalogItem',
-        ]);
-
-        foreach ($cartItems as $cartItem) {
-            $selection = $cartItem->selectedItem();
-            if ($selection === null) {
-                continue;
-            }
-
-            try {
-                $this->reservations->release(
-                    $cartItem,
-                    $selection,
-                    (int) $cartItem->cantidad,
-                    $targetStatus === Purchase::STATUS_EXPIRED
-                        ? StockReservation::STATUS_EXPIRED
-                        : StockReservation::STATUS_RELEASED,
-                );
-            } catch (\InvalidArgumentException) {
-                throw ValidationException::withMessages([
-                    'items' => __('api.purchase.inconsistent_reservation'),
+                ->where('current_stock_reservation_id', $purchase->stock_reservation_id)
+                ->update([
+                    'status' => Cart::STATUS_EXPIRED,
+                    'current_purchase_id' => null,
                ]);
-            }
+
+            return;
+        }
+
+        if ($cart->status === Cart::STATUS_ACTIVE) {
+            $cartUpdate = [
+                'current_purchase_id' => null,
+                'current_stock_reservation_id' => null,
+            ];
+
+            Cart::query()
+                ->whereKey($cart->getKey())
+                ->where('current_purchase_id', $purchase->getKey())
+                ->update($cartUpdate);
+
+            return;
+        }
+
+        if ($cart->status !== Cart::STATUS_CHECKOUT) {
+            return;
        }

        if (! $cart->trashed()) {
-            $cart->update(['status' => 'converted']);
+            $cart->update(['status' => Cart::STATUS_CONVERTED]);
            $cart->delete();
        }
    }
@@ -218,6 +212,17 @@ class ReleaseCheckoutService

    private function loadPurchase(Purchase $purchase): Purchase
    {
-        return $purchase->load(['items.imageAttachment']);
+        return $purchase->load(['items.imageAttachment', 'stockReservation']);
+    }
+
+    private function hasOverdueActiveReservation(Purchase $purchase): bool
+    {
+        /** @var StockReservation|null $reservation */
+        $reservation = $purchase->stockReservation()->lockForUpdate()->first();
+
+        return $reservation !== null
+            && $reservation->status === StockReservation::STATUS_ACTIVE
+            && $reservation->expires_at !== null
+            && ! $reservation->expires_at->isFuture();
    }
 }
--- a/app/Domains/Purchase/Services/Checkout/StartCheckoutService.php
+++ b/app/Domains/Purchase/Services/Checkout/StartCheckoutService.php
@@ -4,6 +4,7 @@ namespace App\Domains\Purchase\Services\Checkout;

 use App\Domains\Cart\Models\Cart;
 use App\Domains\Cart\Models\CartItem;
+use App\Domains\Catalog\Exceptions\StockReservationExpiredException;
 use App\Domains\Catalog\Models\CatalogItem;
 use App\Domains\Catalog\Models\Variant;
 use App\Domains\Catalog\Services\CatalogInventoryService;
@@ -12,6 +13,7 @@ use App\Domains\Purchase\Exceptions\InsufficientStockException;
 use App\Domains\Purchase\Models\Purchase;
 use App\Domains\Purchase\Services\UserPurchaseLimitService;
 use App\Domains\Tenant\Models\Tenant;
+use Illuminate\Support\Carbon;
 use Illuminate\Support\Collection;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Validation\ValidationException;
@@ -169,21 +171,31 @@ class StartCheckoutService
                'cantidad' => $line['quantity'],
            ]);

-            try {
-                $this->reservations->reserve($cartItem, $line['selection'], $line['quantity']);
-            } catch (\InvalidArgumentException) {
-                $availableQuantity = $this->inventory->availableQuantity($line['selection']) ?? 0;
-
-                throw new InsufficientStockException([
-                    $this->unavailableItem($line, $availableQuantity),
-                ]);
-            }
-
            $cartItem->setRelation('catalogItem', $line['catalog_item']);
            $cartItem->setRelation('variant', $line['selection'] instanceof Variant ? $line['selection'] : null);
            $cartItems->push($cartItem);
        }

+        try {
+            $this->reservations->syncCart($cart);
+        } catch (\InvalidArgumentException) {
+            $unavailable = $resolvedLines
+                ->map(function (array $line): ?array {
+                    $availableQuantity = $this->inventory->availableQuantity($line['selection']);
+
+                    return $availableQuantity !== null && $availableQuantity < $line['quantity']
+                        ? $this->unavailableItem($line, $availableQuantity)
+                        : null;
+                })
+                ->filter()
+                ->values()
+                ->all();
+
+            throw new InsufficientStockException($unavailable !== [] ? $unavailable : [
+                $this->unavailableItem($resolvedLines->first(), 0),
+            ]);
+        }
+
        $purchase = $this->createPurchase(
            $tenant,
            $userId,
@@ -194,19 +206,12 @@ class StartCheckoutService
            $cart->getKey(),
        );
        $cart->update(['current_purchase_id' => $purchase->getKey()]);
+        $this->reservations->attachToPurchase($cart, $purchase, $this->checkoutExpiration());

        $cartItems = $cart->items()->orderBy('id')->lockForUpdate()->get();
        $this->loadCartItems($cartItems);
        $purchase->items()->createMany($this->snapshots->fromCartItems($cartItems));

-        foreach ($cartItems as $index => $cartItem) {
-            $this->reservations->attachToPurchase(
-                $cartItem,
-                $resolvedLines->get($index)['selection'],
-                $purchase,
-            );
-        }
-
        return $this->loadPurchase($purchase);
    }

@@ -257,6 +262,7 @@ class StartCheckoutService
        $this->verifyTenantItems($tenant, $cartItems);
        $this->assertCartPurchaseLimits($tenant, $userId, $cartItems, $cart->getKey());
        $cart->setRelation('items', $cartItems);
+        $this->reservations->syncCart($cart);

        $purchase = $this->createPurchase(
            $tenant,
@@ -266,16 +272,9 @@ class StartCheckoutService
            $cart->getKey(),
        );
        $cart->update(['current_purchase_id' => $purchase->getKey()]);
+        $this->reservations->attachToPurchase($cart, $purchase, $this->checkoutExpiration());
        $purchase->items()->createMany($this->snapshots->fromCartItems($cartItems));

-        foreach ($cartItems as $cartItem) {
-            $this->reservations->attachToPurchase(
-                $cartItem,
-                $cartItem->selectedItem(),
-                $purchase,
-            );
-        }
-
        return $this->loadPurchase($purchase);
    }

@@ -316,9 +315,9 @@ class StartCheckoutService
            Purchase::STATUS_CREATED,
            Purchase::STATUS_PENDING_PAYMENT,
        ], true)) {
+            $this->reservations->returnToCart($currentPurchase, $cart);
            $currentPurchase->update([
                'status' => Purchase::STATUS_SUPERSEDED,
-                'expires_at' => null,
            ]);
        }

@@ -331,7 +330,11 @@ class StartCheckoutService
            throw new NotFoundHttpException('Cart not found for tenant.');
        }

-        if ($cart->status !== 'active') {
+        if ($cart->status === Cart::STATUS_EXPIRED) {
+            throw new StockReservationExpiredException;
+        }
+
+        if ($cart->status !== Cart::STATUS_ACTIVE) {
            throw ValidationException::withMessages([
                'cart_id' => __('api.purchase.inactive_cart'),
            ]);
@@ -405,13 +408,17 @@ class StartCheckoutService
            'user_id' => $userId,
            'status' => Purchase::STATUS_CREATED,
            'payment_method' => null,
-            'expires_at' => now()->addMinutes(
-                max(1, (int) config('purchase.checkout_expiration_minutes', 30)),
-            ),
            'total' => $total,
        ]);
    }

+    private function checkoutExpiration(): Carbon
+    {
+        return now()->addMinutes(
+            max(1, (int) config('purchase.checkout_expiration_minutes', 30)),
+        );
+    }
+
    /** @param Collection<int, CartItem> $cartItems */
    private function loadCartItems(Collection $cartItems): void
    {
--- a/app/Domains/Purchase/Services/CheckoutService.php
+++ b/app/Domains/Purchase/Services/CheckoutService.php
@@ -2,7 +2,6 @@

 namespace App\Domains\Purchase\Services;

-use App\Domains\Catalog\Services\StockReservationService;
 use App\Domains\Purchase\Models\Purchase;
 use App\Domains\Purchase\Services\Checkout\CompleteCheckoutService;
 use App\Domains\Purchase\Services\Checkout\EditCheckoutService;
@@ -23,7 +22,6 @@ class CheckoutService
        private readonly EditCheckoutService $editor,
        private readonly CompleteCheckoutService $completer,
        private readonly ReleaseCheckoutService $releaser,
-        private readonly StockReservationService $reservations,
    ) {}

    /** @param array<string, mixed> $purchaseData */
@@ -77,14 +75,4 @@ class CheckoutService
    {
        return $this->releaser->expire($purchase);
    }
-
-    public function expireOverduePurchases(): int
-    {
-        return $this->releaser->expireOverdue();
-    }
-
-    public function syncReservationExpiration(Purchase $purchase): void
-    {
-        $this->reservations->syncPurchaseExpiration($purchase);
-    }
 }
--- a/app/Domains/Purchase/Services/DniDistanceService.php
+++ b/app/Domains/Purchase/Services/DniDistanceService.php
@@ -0,0 +1,82 @@
+<?php
+
+namespace App\Domains\Purchase\Services;
+
+/**
+ * Measures likely DNI typing errors using the optimal-string-alignment
+ * variant of the Damerau-Levenshtein distance.
+ *
+ * The returned value is the minimum number of single-character edits needed
+ * to transform one DNI into the other. Supported edits are insertion,
+ * deletion, substitution and transposition of two adjacent digits.
+ */
+class DniDistanceService
+{
+    /**
+     * Calculate the edit distance between two normalized DNI strings.
+     *
+     * Each matrix cell [row][column] stores the minimum edits required to
+     * transform the first $row digits of $left into the first $column digits
+     * of $right. The bottom-right cell therefore contains the final distance.
+     */
+    public function distance(string $left, string $right): int
+    {
+        $left = $this->normalize($left);
+        $right = $this->normalize($right);
+        $leftLength = strlen($left);
+        $rightLength = strlen($right);
+        $matrix = [];
+
+        // Transforming a prefix into an empty string requires deleting every digit.
+        for ($row = 0; $row <= $leftLength; $row++) {
+            $matrix[$row] = [$row];
+        }
+
+        // Transforming an empty string into a prefix requires inserting every digit.
+        for ($column = 0; $column <= $rightLength; $column++) {
+            $matrix[0][$column] = $column;
+        }
+
+        for ($row = 1; $row <= $leftLength; $row++) {
+            for ($column = 1; $column <= $rightLength; $column++) {
+                $substitutionCost = $left[$row - 1] === $right[$column - 1] ? 0 : 1;
+                $deletionDistance = $matrix[$row - 1][$column] + 1;
+                $insertionDistance = $matrix[$row][$column - 1] + 1;
+                $substitutionDistance = $matrix[$row - 1][$column - 1] + $substitutionCost;
+
+                // Keep the cheapest way to align the two prefixes at this position.
+                $matrix[$row][$column] = min(
+                    $deletionDistance,
+                    $insertionDistance,
+                    $substitutionDistance,
+                );
+
+                // Count two adjacent inverted digits as one edit instead of two substitutions.
+                if (
+                    $row > 1
+                    && $column > 1
+                    && $left[$row - 1] === $right[$column - 2]
+                    && $left[$row - 2] === $right[$column - 1]
+                ) {
+                    $matrix[$row][$column] = min(
+                        $matrix[$row][$column],
+                        $matrix[$row - 2][$column - 2] + 1,
+                    );
+                }
+            }
+        }
+
+        return $matrix[$leftLength][$rightLength];
+    }
+
+    /**
+     * Keep only digits and left-pad seven-digit DNIs so comparisons preserve
+     * the leading zero that is present when the DNI is extracted from a CUIT.
+     */
+    public function normalize(string $dni): string
+    {
+        $digits = preg_replace('/\D+/', '', $dni) ?? '';
+
+        return str_pad($digits, 8, '0', STR_PAD_LEFT);
+    }
+}
--- a/app/Domains/Purchase/Services/PurchaseStateGuard.php
+++ b/app/Domains/Purchase/Services/PurchaseStateGuard.php
@@ -3,6 +3,7 @@
 namespace App\Domains\Purchase\Services;

 use App\Domains\Cart\Models\Cart;
+use App\Domains\Catalog\Models\StockReservation;
 use App\Domains\Purchase\Exceptions\PurchaseExpiredException;
 use App\Domains\Purchase\Models\Purchase;
 use Illuminate\Validation\ValidationException;
@@ -11,15 +12,32 @@ class PurchaseStateGuard
 {
    public function assertNotExpired(Purchase $purchase): void
    {
-        $hasExpiredStatus = $purchase->status === Purchase::STATUS_EXPIRED;
-        $hasExpiredByTime = in_array($purchase->status, [
+        if ($purchase->status === Purchase::STATUS_EXPIRED) {
+            throw new PurchaseExpiredException;
+        }
+
+        if (! in_array($purchase->status, [
            Purchase::STATUS_CREATED,
            Purchase::STATUS_PENDING_PAYMENT,
-        ], true)
-            && $purchase->expires_at !== null
-            && $purchase->expires_at->isPast();
+        ], true)) {
+            return;
+        }

-        if ($hasExpiredStatus || $hasExpiredByTime) {
+        /** @var StockReservation|null $reservation */
+        $reservation = $purchase->relationLoaded('stockReservation')
+            ? $purchase->getRelation('stockReservation')
+            : ($purchase->exists
+                ? $purchase->stockReservation()->first()
+                : null);
+
+        if ($reservation !== null && (
+            $reservation->status === StockReservation::STATUS_EXPIRED
+            || (
+                $reservation->status === StockReservation::STATUS_ACTIVE
+                && $reservation->expires_at !== null
+                && ! $reservation->expires_at->isFuture()
+            )
+        )) {
            throw new PurchaseExpiredException;
        }
    }
--- a/app/Domains/Purchase/Services/TenantTransactionResetService.php
+++ b/app/Domains/Purchase/Services/TenantTransactionResetService.php
@@ -135,11 +135,25 @@ class TenantTransactionResetService
     */
    private function reservationQuery(array $scope): Builder
    {
+        $reservationIds = DB::table('carritos')
+            ->whereIn('id', $scope['cart_ids'])
+            ->whereNotNull('current_stock_reservation_id')
+            ->pluck('current_stock_reservation_id')
+            ->merge(
+                DB::table('compras')
+                    ->whereIn('id', $scope['purchase_ids'])
+                    ->whereNotNull('stock_reservation_id')
+                    ->pluck('stock_reservation_id'),
+            )
+            ->merge(
+                DB::table('stock_reservation_lines')
+                    ->whereIn('inventory_id', $scope['inventory_ids'])
+                    ->pluck('stock_reservation_id'),
+            )
+            ->unique()
+            ->values();
+
        return DB::table('stock_reservations')
-            ->where(function (Builder $query) use ($scope): void {
-                $query->whereIn('inventory_id', $scope['inventory_ids'])
-                    ->orWhereIn('purchase_id', $scope['purchase_ids'])
-                    ->orWhereIn('cart_item_id', $scope['cart_item_ids']);
-            });
+            ->whereIn('id', $reservationIds);
    }
 }
--- a/app/Domains/Purchase/Services/UserPurchaseLimitService.php
+++ b/app/Domains/Purchase/Services/UserPurchaseLimitService.php
@@ -88,9 +88,9 @@ class UserPurchaseLimitService
                        $excludedCartId !== null,
                        fn ($query) => $query->whereKeyNot($excludedCartId),
                    ))
-                ->whereHas('stockReservations', fn ($query) => $query
+                ->whereHas('cart.currentStockReservation', fn ($query) => $query
                    ->where('status', 'active')
-                    ->whereNull('purchase_id'))
+                    ->whereDoesntHave('purchase'))
                ->sum('cantidad');

            if ($purchasedQuantity + $checkoutQuantity + $reservedCartQuantity + $requestedQuantity > $limit) {
@@ -161,9 +161,9 @@ class UserPurchaseLimitService
            ->whereHas('cart', fn ($query) => $query
                ->where('user_id', $userId)
                ->where('status', 'active'))
-            ->whereHas('stockReservations', fn ($query) => $query
+            ->whereHas('cart.currentStockReservation', fn ($query) => $query
                ->where('status', 'active')
-                ->whereNull('purchase_id'))
+                ->whereDoesntHave('purchase'))
            ->groupBy('catalog_item_id')
            ->pluck('quantity', 'catalog_item_id');

--- a/app/Domains/Purchase/documentacion/README.md
+++ b/app/Domains/Purchase/documentacion/README.md
@@ -6,7 +6,7 @@ Implementa el ciclo de compra y checkout: crea la cabecera de compra desde un ca

 ## Modelo

- `Purchase`: raíz de la compra; estados `created`, `pending_payment`, `in_review`, `paid`, `cancelled`, `rejected` y `expired`.
+- `Purchase`: raíz de la compra; estados `created`, `pending_payment`, `in_review`, `paid`, `cancelled`, `rejected` y `expired`, y referencia la reserva que respaldó ese intento de checkout. No guarda un vencimiento propio: expira como consecuencia del vencimiento de su reserva.
 - `PurchaseItem`: snapshot definitivo del producto o variante, creado recién al confirmar la compra.
 - `TelepagosQr` y `TelepagosPayment`: datos del QR e intentos/resultados del proveedor.
 - `PurchasePaid`: evento emitido una sola vez al pasar a pagada bajo bloqueo transaccional.
@@ -15,16 +15,16 @@ Implementa el ciclo de compra y checkout: crea la cabecera de compra desde un ca

 `CheckoutService` es la fachada estable. Delega en:

- `StartCheckoutService`: inicia la compra desde el carrito o crea un carrito técnico para compra directa, sin crear todavía `PurchaseItem`.
+- `StartCheckoutService`: inicia la compra desde el carrito o crea un carrito técnico para compra directa, refresca el vencimiento de la reserva agregada y crea los snapshots `PurchaseItem`.
 - `EditCheckoutService`: modifica los datos del comprador antes del cierre.
 - `CompleteCheckoutService`: completa, envía a revisión o materializa los `PurchaseItem` al confirmar el pago.
- `ReleaseCheckoutService`: cancela, vence y procesa vencimientos pendientes.
+- `ReleaseCheckoutService`: cancela o vence una compra y aplica sus efectos comerciales; el scanner unificado del dominio Catalog detecta las reservas pendientes de vencimiento.
 - `SourceCartService`: sincroniza o finaliza el carrito de checkout asociado a la compra.
 - `CatalogSelectionResolver` y `PurchaseItemSnapshotFactory`: resuelven selecciones y generan snapshots.

-Al informar una transferencia, la compra pasa de `pending_payment` a `in_review` y deja de vencer. Si el comprador abandona el checkout durante la revisión, la compra y sus reservas permanecen intactas y se crea un carrito activo nuevo para que pueda seguir comprando. Adminapp puede confirmar o anular explícitamente la compra en revisión.
+Al iniciar checkout o elegir un medio de pago se refresca directamente `StockReservation.expires_at`, que es la única fuente de verdad y se expone como `expires_at` en la respuesta pública de la compra. El refresco sólo se permite mientras la reserva siga vigente; una fecha vencida bloquea todas las mutaciones aun antes de que corra el scheduler. Al materializar la expiración, la compra pagable, su carrito y la reserva pasan a `expired` dentro de la misma transacción. Al cancelar o reemplazar una compra recuperable, ésta se desvincula y el carrito conserva la misma reserva activa. Al informar una transferencia, la compra pasa de `pending_payment` a `in_review` y ese vencimiento se limpia. Si el comprador abandona el checkout durante la revisión, la compra y sus reservas permanecen intactas y se crea un carrito activo nuevo para que pueda seguir comprando. Adminapp puede confirmar o anular explícitamente la compra en revisión.

-Las cantidades y variantes se editan mediante el dominio Cart. El endpoint autenticado `PATCH /checkout-carts/{cart}/items/{cartItem}` valida que el carrito pertenezca al usuario y a una compra editable. Cuando existe un cambio real, invalida atómicamente el intento de pago anterior, recalcula el total y renueva la reserva; Purchase no expone operaciones sobre líneas antes de la confirmación.
+Las cantidades y variantes se editan mediante el dominio Cart. El endpoint autenticado `PATCH /checkout-carts/{cart}/items/{cartItem}` valida que el carrito pertenezca al usuario y a una compra editable. Cuando existe un cambio real, invalida atómicamente el intento de pago anterior, devuelve la misma reserva activa al carrito y sincroniza sus líneas con el contenido actualizado; Purchase no expone operaciones sobre líneas antes de la confirmación.

 `UserPurchaseLimitService` controla límites de compra y `CheckoutService` conserva el punto de entrada para controladores e integraciones.

--- a/bootstrap/app.php
+++ b/bootstrap/app.php
@@ -1,6 +1,7 @@
 <?php

 use App\Domains\Auth\Exceptions\AccountLockedException;
+use App\Domains\Catalog\Exceptions\StockReservationExpiredException;
 use App\Domains\Purchase\Exceptions\InsufficientStockException;
 use App\Domains\Purchase\Exceptions\PurchaseExpiredException;
 use App\Domains\Purchase\Exceptions\PurchaseLimitExceededException;
@@ -113,6 +114,16 @@ return Application::configure(basePath: dirname(__DIR__))
                'message' => $exception->getMessage(),
            ], 422);
        });
+        $exceptions->render(function (StockReservationExpiredException $exception, Request $request) {
+            if (! $request->is('api/*')) {
+                return null;
+            }
+
+            return response()->json([
+                'code' => 'stock_reservation.expired',
+                'message' => $exception->getMessage(),
+            ], 422);
+        });
        $exceptions->render(function (ModelNotFoundException $exception, Request $request) {
            if (! $request->is('api/*')) {
                return null;
--- a/config/auth.php
+++ b/config/auth.php
@@ -96,7 +96,7 @@ return [
        'users' => [
            'provider' => 'users',
            'table' => env('AUTH_PASSWORD_RESET_TOKEN_TABLE', 'password_reset_tokens'),
-            'expire' => 60,
+            'expire' => (int) env('AUTH_PASSWORD_RESET_EXPIRATION_MINUTES', 60),
            'throttle' => 60,
        ],
    ],
--- a/config/purchase.php
+++ b/config/purchase.php
@@ -8,4 +8,9 @@ return [
        'telepagos' => (int) env('PURCHASE_TELEPAGOS_EXPIRATION_MINUTES', 30),
        'transfer' => (int) env('PURCHASE_TRANSFER_EXPIRATION_MINUTES', 1440),
    ],
+
+    'transfer_candidate_amount_tolerance_percentage' => (float) env(
+        'PURCHASE_TRANSFER_CANDIDATE_AMOUNT_TOLERANCE_PERCENTAGE',
+        5,
+    ),
 ];
--- a/database/migrations/2026_08_25_010000_add_expires_at_to_reset_password_attempts_table.php
+++ b/database/migrations/2026_08_25_010000_add_expires_at_to_reset_password_attempts_table.php
@@ -0,0 +1,32 @@
+<?php
+
+use App\Domains\Auth\Models\ResetPasswordAttempt;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('reset_password_attempts', function (Blueprint $table): void {
+            $table->timestamp('expires_at')->nullable()->after('status');
+        });
+
+        // Attempts created before this migration did not have an expiration instant.
+        DB::table('reset_password_attempts')
+            ->whereIn('status', [
+                ResetPasswordAttempt::STATUS_PENDING,
+                ResetPasswordAttempt::STATUS_VALIDATED,
+            ])
+            ->update(['status' => ResetPasswordAttempt::STATUS_EXPIRED]);
+    }
+
+    public function down(): void
+    {
+        Schema::table('reset_password_attempts', function (Blueprint $table): void {
+            $table->dropColumn('expires_at');
+        });
+    }
+};
--- a/database/migrations/2026_08_25_020000_centralize_stock_reservations.php
+++ b/database/migrations/2026_08_25_020000_centralize_stock_reservations.php
@@ -0,0 +1,180 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::rename('stock_reservations', 'stock_reservation_lines');
+
+        Schema::create('stock_reservations', function (Blueprint $table): void {
+            $table->id();
+            $table->string('status')->default('active');
+            $table->dateTime('expires_at')->nullable();
+            $table->dateTime('committed_at')->nullable();
+            $table->dateTime('released_at')->nullable();
+            $table->dateTime('expired_at')->nullable();
+            $table->string('release_reason')->nullable();
+            $table->timestamps();
+
+            $table->index(['status', 'expires_at']);
+        });
+
+        Schema::table('stock_reservation_lines', function (Blueprint $table): void {
+            $table->foreignId('stock_reservation_id')->nullable()->after('id');
+            $table->boolean('tracks_inventory')->default(true)->after('quantity');
+        });
+
+        Schema::table('carritos', function (Blueprint $table): void {
+            $table->foreignId('current_stock_reservation_id')->nullable()->after('current_purchase_id');
+        });
+
+        Schema::table('compras', function (Blueprint $table): void {
+            $table->foreignId('stock_reservation_id')->nullable()->after('cart_id');
+        });
+
+        $cartIdsByItem = DB::table('carrito_items')->pluck('cart_id', 'id');
+        $unlimitedInventoryIds = DB::table('catalog_items')
+            ->where('inventory_policy', 'unlimited')
+            ->whereNotNull('inventory_id')
+            ->pluck('inventory_id')
+            ->merge(
+                DB::table('variantes')
+                    ->join('catalog_items', 'catalog_items.id', '=', 'variantes.catalog_item_id')
+                    ->where('catalog_items.inventory_policy', 'unlimited')
+                    ->pluck('variantes.inventory_id'),
+            )
+            ->map(fn ($id): int => (int) $id)
+            ->unique();
+        $legacyRows = DB::table('stock_reservation_lines')->orderBy('id')->get();
+        $groups = $legacyRows->groupBy(function (object $row) use ($cartIdsByItem): string {
+            if ($row->purchase_id !== null) {
+                return 'purchase:'.$row->purchase_id;
+            }
+
+            $cartId = $row->cart_item_id === null ? null : $cartIdsByItem->get($row->cart_item_id);
+
+            return $cartId === null ? 'legacy:'.$row->id : 'cart:'.$cartId;
+        });
+
+        foreach ($groups as $key => $rows) {
+            $statuses = $rows->pluck('status');
+            $status = $statuses->contains('active')
+                ? 'active'
+                : ($statuses->contains('committed')
+                    ? 'committed'
+                    : ($statuses->contains('expired') ? 'expired' : 'released'));
+            $first = $rows->first();
+            $reservationId = DB::table('stock_reservations')->insertGetId([
+                'status' => $status,
+                'expires_at' => $status === 'active' ? $rows->pluck('expires_at')->filter()->max() : null,
+                'committed_at' => $status === 'committed' ? $rows->pluck('committed_at')->filter()->max() : null,
+                'released_at' => $status === 'released' ? $rows->pluck('released_at')->filter()->max() : null,
+                'expired_at' => $status === 'expired' ? $rows->pluck('released_at')->filter()->max() : null,
+                'release_reason' => null,
+                'created_at' => $first->created_at,
+                'updated_at' => $rows->pluck('updated_at')->filter()->max() ?? $first->updated_at,
+            ]);
+
+            foreach ($rows->groupBy('inventory_id') as $inventoryRows) {
+                $line = $inventoryRows->first();
+                DB::table('stock_reservation_lines')->where('id', $line->id)->update([
+                    'stock_reservation_id' => $reservationId,
+                    'quantity' => $inventoryRows->sum('quantity'),
+                    'tracks_inventory' => ! $unlimitedInventoryIds->contains((int) $line->inventory_id),
+                ]);
+                DB::table('stock_reservation_lines')
+                    ->whereIn('id', $inventoryRows->pluck('id')->skip(1))
+                    ->delete();
+            }
+
+            if (str_starts_with($key, 'purchase:')) {
+                $purchaseId = (int) substr($key, strlen('purchase:'));
+                DB::table('compras')->where('id', $purchaseId)->update([
+                    'stock_reservation_id' => $reservationId,
+                ]);
+                $cartId = DB::table('compras')->where('id', $purchaseId)->value('cart_id');
+                $isCurrent = $cartId !== null
+                    && (int) DB::table('carritos')->where('id', $cartId)->value('current_purchase_id') === $purchaseId;
+
+                if ($status === 'active' && $isCurrent) {
+                    DB::table('carritos')->where('id', $cartId)->update([
+                        'current_stock_reservation_id' => $reservationId,
+                    ]);
+                }
+            } elseif (str_starts_with($key, 'cart:') && $status === 'active') {
+                DB::table('carritos')->where('id', (int) substr($key, strlen('cart:')))->update([
+                    'current_stock_reservation_id' => $reservationId,
+                ]);
+            }
+        }
+
+        if (DB::getDriverName() !== 'sqlite') {
+            Schema::table('stock_reservation_lines', function (Blueprint $table): void {
+                $table->dropForeign('stock_reservations_cart_item_id_foreign');
+                $table->dropForeign('stock_reservations_purchase_id_foreign');
+                $table->dropUnique('stock_reservations_cart_item_id_inventory_id_unique');
+                $table->dropIndex('stock_reservations_purchase_id_status_index');
+                $table->dropIndex('stock_reservations_status_expires_at_index');
+            });
+        }
+
+        Schema::table('stock_reservation_lines', function (Blueprint $table): void {
+            $table->unsignedBigInteger('stock_reservation_id')->nullable(false)->change();
+            $table->dropColumn([
+                'cart_item_id',
+                'purchase_id',
+                'status',
+                'expires_at',
+                'committed_at',
+                'released_at',
+            ]);
+            $table->foreign('stock_reservation_id', 'reservation_lines_reservation_fk')
+                ->references('id')
+                ->on('stock_reservations')
+                ->cascadeOnDelete();
+            $table->unique(
+                ['stock_reservation_id', 'inventory_id'],
+                'reservation_lines_reservation_inventory_unique',
+            );
+        });
+
+        Schema::table('carritos', function (Blueprint $table): void {
+            $table->foreign('current_stock_reservation_id', 'carts_current_stock_reservation_fk')
+                ->references('id')
+                ->on('stock_reservations')
+                ->nullOnDelete();
+            $table->unique('current_stock_reservation_id', 'carts_current_stock_reservation_unique');
+        });
+
+        Schema::table('compras', function (Blueprint $table): void {
+            $table->foreign('stock_reservation_id', 'purchases_stock_reservation_fk')
+                ->references('id')
+                ->on('stock_reservations')
+                ->nullOnDelete();
+            $table->unique('stock_reservation_id', 'purchases_stock_reservation_unique');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('compras', function (Blueprint $table): void {
+            $table->dropUnique('purchases_stock_reservation_unique');
+            $table->dropForeign('purchases_stock_reservation_fk');
+            $table->dropColumn('stock_reservation_id');
+        });
+
+        Schema::table('carritos', function (Blueprint $table): void {
+            $table->dropUnique('carts_current_stock_reservation_unique');
+            $table->dropForeign('carts_current_stock_reservation_fk');
+            $table->dropColumn('current_stock_reservation_id');
+        });
+
+        Schema::dropIfExists('stock_reservation_lines');
+        Schema::dropIfExists('stock_reservations');
+    }
+};
--- a/database/migrations/2026_08_25_160000_make_stock_reservation_expiration_authoritative.php
+++ b/database/migrations/2026_08_25_160000_make_stock_reservation_expiration_authoritative.php
@@ -0,0 +1,51 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        DB::table('compras')
+            ->whereNotNull('stock_reservation_id')
+            ->orderBy('id')
+            ->chunkById(500, function ($purchases): void {
+                foreach ($purchases as $purchase) {
+                    DB::table('stock_reservations')
+                        ->where('id', $purchase->stock_reservation_id)
+                        ->where('status', 'active')
+                        ->update(['expires_at' => $purchase->expires_at]);
+                }
+            });
+
+        Schema::table('compras', function (Blueprint $table): void {
+            $table->dropIndex(['expires_at']);
+            $table->dropColumn('expires_at');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('compras', function (Blueprint $table): void {
+            $table->timestamp('expires_at')->nullable()->index()->after('payment_method');
+        });
+
+        DB::table('compras')
+            ->whereNotNull('stock_reservation_id')
+            ->orderBy('id')
+            ->chunkById(500, function ($purchases): void {
+                foreach ($purchases as $purchase) {
+                    DB::table('compras')
+                        ->where('id', $purchase->id)
+                        ->update([
+                            'expires_at' => DB::table('stock_reservations')
+                                ->where('id', $purchase->stock_reservation_id)
+                                ->value('expires_at'),
+                        ]);
+                }
+            });
+    }
+};
--- a/database/migrations/2026_08_25_170000_propagate_expired_stock_reservations.php
+++ b/database/migrations/2026_08_25_170000_propagate_expired_stock_reservations.php
@@ -0,0 +1,30 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        $expiredReservationIds = fn ($query) => $query
+            ->select('id')
+            ->from('stock_reservations')
+            ->where('status', 'expired');
+
+        DB::table('compras')
+            ->whereIn('status', ['created', 'pending_payment'])
+            ->whereIn('stock_reservation_id', $expiredReservationIds)
+            ->update(['status' => 'expired']);
+
+        DB::table('carritos')
+            ->whereIn('status', ['active', 'checkout'])
+            ->whereIn('current_stock_reservation_id', $expiredReservationIds)
+            ->update(['status' => 'expired']);
+    }
+
+    public function down(): void
+    {
+        // Terminal business states cannot be reversed without inventing their prior state.
+    }
+};
--- a/database/migrations/2026_08_27_000000_create_telepagos_payment_candidates_table.php
+++ b/database/migrations/2026_08_27_000000_create_telepagos_payment_candidates_table.php
@@ -0,0 +1,141 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('telepagos_payment_candidates', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('telepagos_payment_id')
+                ->constrained('telepagos_payments')
+                ->cascadeOnDelete();
+            $table->foreignId('compra_id')->constrained('compras')->cascadeOnDelete();
+            $table->boolean('dni_matches');
+            $table->boolean('amount_matches');
+            $table->decimal('payment_amount', 10, 2);
+            $table->decimal('purchase_amount', 10, 2);
+            $table->decimal('amount_difference', 10, 2);
+            $table->string('match_reason');
+            $table->string('confidence');
+            $table->timestamps();
+
+            $table->unique(
+                ['telepagos_payment_id', 'compra_id'],
+                'telepagos_payment_candidate_unique',
+            );
+        });
+
+        $this->migrateExistingCandidates();
+
+        Schema::table('telepagos_payments', function (Blueprint $table) {
+            $table->dropColumn('matched_purchase_ids');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('telepagos_payments', function (Blueprint $table) {
+            $table->json('matched_purchase_ids')->nullable()->after('compra_id');
+        });
+
+        DB::table('telepagos_payments')
+            ->whereNull('compra_id')
+            ->orderBy('id')
+            ->each(function (object $payment): void {
+                $candidateIds = DB::table('telepagos_payment_candidates')
+                    ->where('telepagos_payment_id', $payment->id)
+                    ->pluck('compra_id')
+                    ->all();
+
+                if ($candidateIds !== []) {
+                    DB::table('telepagos_payments')
+                        ->where('id', $payment->id)
+                        ->update(['matched_purchase_ids' => json_encode($candidateIds)]);
+                }
+            });
+
+        Schema::dropIfExists('telepagos_payment_candidates');
+    }
+
+    private function migrateExistingCandidates(): void
+    {
+        DB::table('telepagos_payments')
+            ->whereNull('compra_id')
+            ->whereNotNull('matched_purchase_ids')
+            ->orderBy('id')
+            ->each(function (object $payment): void {
+                $candidateIds = json_decode((string) $payment->matched_purchase_ids, true);
+
+                if (! is_array($candidateIds)) {
+                    return;
+                }
+
+                $paymentAmount = number_format((float) $payment->amount, 2, '.', '');
+                $payerDni = $payment->cuit_buyer
+                    ? substr((string) $payment->cuit_buyer, 2, -1)
+                    : null;
+
+                foreach ($candidateIds as $candidateId) {
+                    $purchase = DB::table('compras')->find($candidateId);
+
+                    if ($purchase === null) {
+                        continue;
+                    }
+
+                    $purchaseAmount = number_format((float) $purchase->total, 2, '.', '');
+                    $dniMatches = $payerDni !== null && $purchase->transfer_payer_dni === $payerDni;
+                    $amountMatches = $purchaseAmount === $paymentAmount;
+
+                    DB::table('telepagos_payment_candidates')->insertOrIgnore([
+                        'telepagos_payment_id' => $payment->id,
+                        'compra_id' => $purchase->id,
+                        'dni_matches' => $dniMatches,
+                        'amount_matches' => $amountMatches,
+                        'payment_amount' => $paymentAmount,
+                        'purchase_amount' => $purchaseAmount,
+                        'amount_difference' => number_format(
+                            abs((float) $purchaseAmount - (float) $paymentAmount),
+                            2,
+                            '.',
+                            '',
+                        ),
+                        'match_reason' => $this->matchReason($dniMatches, $amountMatches),
+                        'confidence' => $this->confidence($dniMatches, $amountMatches),
+                        'created_at' => $payment->created_at,
+                        'updated_at' => $payment->updated_at,
+                    ]);
+                }
+            });
+    }
+
+    private function matchReason(bool $dniMatches, bool $amountMatches): string
+    {
+        if ($dniMatches && $amountMatches) {
+            return 'ambiguous_exact_match';
+        }
+
+        if ($dniMatches) {
+            return 'exact_dni_near_amount';
+        }
+
+        if ($amountMatches) {
+            return 'exact_amount_different_dni';
+        }
+
+        return 'legacy_candidate';
+    }
+
+    private function confidence(bool $dniMatches, bool $amountMatches): string
+    {
+        if ($dniMatches && $amountMatches) {
+            return 'exact';
+        }
+
+        return $dniMatches ? 'high' : 'medium';
+    }
+};
--- a/database/migrations/2026_08_27_010000_add_dni_distance_to_telepagos_payment_candidates.php
+++ b/database/migrations/2026_08_27_010000_add_dni_distance_to_telepagos_payment_candidates.php
@@ -0,0 +1,61 @@
+<?php
+
+use App\Domains\Purchase\Services\DniDistanceService;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('telepagos_payment_candidates', function (Blueprint $table) {
+            $table->unsignedTinyInteger('dni_distance')->nullable()->after('dni_matches');
+            $table->string('payment_dni', 8)->nullable()->after('dni_distance');
+            $table->string('purchase_dni', 8)->nullable()->after('payment_dni');
+        });
+
+        $dniDistance = new DniDistanceService;
+
+        DB::table('telepagos_payment_candidates as candidate')
+            ->join('telepagos_payments as payment', 'payment.id', '=', 'candidate.telepagos_payment_id')
+            ->join('compras as purchase', 'purchase.id', '=', 'candidate.compra_id')
+            ->select([
+                'candidate.id',
+                'candidate.match_reason',
+                'payment.cuit_buyer',
+                'purchase.transfer_payer_dni',
+            ])
+            ->orderBy('candidate.id')
+            ->each(function (object $candidate) use ($dniDistance): void {
+                if ($candidate->cuit_buyer === null || $candidate->transfer_payer_dni === null) {
+                    return;
+                }
+
+                $payerDni = substr((string) $candidate->cuit_buyer, 2, -1);
+                $distance = $dniDistance->distance($payerDni, (string) $candidate->transfer_payer_dni);
+
+                if ($candidate->match_reason === 'exact_amount_different_dni' && $distance > 2) {
+                    DB::table('telepagos_payment_candidates')->where('id', $candidate->id)->delete();
+
+                    return;
+                }
+
+                DB::table('telepagos_payment_candidates')
+                    ->where('id', $candidate->id)
+                    ->update([
+                        'dni_distance' => $distance,
+                        'payment_dni' => $payerDni,
+                        'purchase_dni' => $candidate->transfer_payer_dni,
+                    ]);
+            });
+    }
+
+    public function down(): void
+    {
+        Schema::table('telepagos_payment_candidates', function (Blueprint $table) {
+            $table->dropColumn(['dni_distance', 'payment_dni', 'purchase_dni']);
+        });
+    }
+};
--- a/database/migrations/2026_08_27_020000_rename_near_dni_candidate_reason.php
+++ b/database/migrations/2026_08_27_020000_rename_near_dni_candidate_reason.php
@@ -0,0 +1,21 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        DB::table('telepagos_payment_candidates')
+            ->where('match_reason', 'exact_amount_different_dni')
+            ->update(['match_reason' => 'exact_amount_near_dni']);
+    }
+
+    public function down(): void
+    {
+        DB::table('telepagos_payment_candidates')
+            ->where('match_reason', 'exact_amount_near_dni')
+            ->update(['match_reason' => 'exact_amount_different_dni']);
+    }
+};
--- a/lang/en/api.php
+++ b/lang/en/api.php
@@ -12,6 +12,7 @@ return [
        'password_reset_invalid' => 'The password recovery request is invalid or has already been used.',
        'password_updated' => 'Password updated successfully.',
        'reset_code_invalid' => 'The code you entered is invalid.',
+        'reset_code_expired' => 'The password recovery code expired. Request a new one.',
        'reset_code_valid' => 'Code validated successfully.',
        'invalid_tenant_or_return_url' => 'The tenant or return URL is invalid.',
        'request_expired' => 'The authentication request expired. Please try again.',
@@ -34,6 +35,7 @@ return [
        'bundle_variant_forbidden' => 'A bundle cannot have a variant.',
        'empty_bundle' => 'The bundle has no components.',
        'variant_required' => 'You must select a variant for this item.',
+        'reservation_expired' => 'The stock reservation has expired. Use the active cart to continue.',
    ],
    'purchase' => [
        'expired' => 'The purchase has expired. Please start a new purchase.',
--- a/lang/es/api.php
+++ b/lang/es/api.php
@@ -12,6 +12,7 @@ return [
        'password_reset_invalid' => 'La solicitud de recuperación es inválida o ya fue utilizada.',
        'password_updated' => 'Contraseña modificada correctamente.',
        'reset_code_invalid' => 'El código ingresado es inválido.',
+        'reset_code_expired' => 'El código de recuperación expiró. Solicitá uno nuevo.',
        'reset_code_valid' => 'Código validado correctamente.',
        'invalid_tenant_or_return_url' => 'El tenant o la URL de retorno no son válidos.',
        'request_expired' => 'La solicitud de autenticación expiró. Intenta nuevamente.',
@@ -34,6 +35,7 @@ return [
        'bundle_variant_forbidden' => 'Un bundle no admite una variante.',
        'empty_bundle' => 'El bundle no tiene componentes.',
        'variant_required' => 'Debe seleccionar una variante para este ítem.',
+        'reservation_expired' => 'La reserva de stock venció. Usá el carrito activo para continuar.',
    ],
    'purchase' => [
        'expired' => "La compra venci\u{00F3}. Inici\u{00E1} una nueva compra.",
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -19,6 +19,7 @@
    </source>
    <php>
        <env name="APP_ENV" value="testing"/>
+        <env name="DB_DATABASE" value="shopit_test" force="true"/>
        <env name="APP_MAINTENANCE_DRIVER" value="file"/>
        <env name="APP_CONFIG_CACHE" value="bootstrap/cache/phpunit-config.php"/>
        <env name="APP_EVENTS_CACHE" value="bootstrap/cache/phpunit-events.php"/>
--- a/routes/console.php
+++ b/routes/console.php
@@ -15,7 +15,9 @@ Artisan::command('reservations:expire', function (): void {
    $expired = app(ExpireStockReservationsService::class)->expireOverdue();

    $this->info("Expired purchases: {$expired['purchases']}");
-    $this->info("Expired cart items: {$expired['cart_items']}");
+    $this->info("Expired cart reservations: {$expired['cart_reservations']}");
+    $this->info("Expired orphan reservations: {$expired['orphan_reservations']}");
+    $this->info("Failed reservations: {$expired['failed']}");
 })->purpose('Release expired stock reservations from purchases and abandoned carts');

 Schedule::command('reservations:expire')
--- a/tests/Feature/Auth/CreateResetPasswordAttemptControllerTest.php
+++ b/tests/Feature/Auth/CreateResetPasswordAttemptControllerTest.php
@@ -69,6 +69,10 @@ class CreateResetPasswordAttemptControllerTest extends TestCase
        $this->assertTrue($attempt->user->is($user));
        $this->assertMatchesRegularExpression('/^\d{4}$/', $attempt->codigo);
        $this->assertSame(ResetPasswordAttempt::STATUS_PENDING, $attempt->status);
+        $this->assertTrue($attempt->expires_at->between(
+            now()->addMinutes(59),
+            now()->addMinutes(60),
+        ));
        Event::assertDispatched(
            PasswordResetRequested::class,
            fn (PasswordResetRequested $event): bool => $event->attemptId === $attempt->id
--- a/tests/Feature/Auth/ResetPasswordAttemptTest.php
+++ b/tests/Feature/Auth/ResetPasswordAttemptTest.php
@@ -18,7 +18,9 @@ class ResetPasswordAttemptTest extends TestCase
            'id',
            'user_id',
            'codigo',
+            'reason',
            'status',
+            'expires_at',
        ], Schema::getColumnListing('reset_password_attempts'));
    }

@@ -28,12 +30,14 @@ class ResetPasswordAttemptTest extends TestCase

        $attempt = $user->resetPasswordAttempts()->create([
            'codigo' => '123456',
+            'expires_at' => now()->addHour(),
        ]);

        $this->assertSame(ResetPasswordAttempt::STATUS_PENDING, $attempt->status);
        $this->assertTrue($attempt->user->is($user));
        $this->assertTrue($user->resetPasswordAttempts->contains($attempt));
        $this->assertFalse($attempt->usesTimestamps());
+        $this->assertTrue($attempt->expires_at->isFuture());
        $this->assertArrayNotHasKey('codigo', $attempt->toArray());
    }

--- a/tests/Feature/Auth/ResetPasswordControllerTest.php
+++ b/tests/Feature/Auth/ResetPasswordControllerTest.php
@@ -99,6 +99,30 @@ class ResetPasswordControllerTest extends TestCase
        $this->assertSame(ResetPasswordAttempt::STATUS_USED, $attempt->fresh()->status);
    }

+    public function test_an_expired_validated_attempt_cannot_reset_the_password(): void
+    {
+        $user = User::factory()->create([
+            'email' => 'ada@example.com',
+            'password' => 'OldSecret!123',
+        ]);
+        $attempt = $user->resetPasswordAttempts()->create([
+            'codigo' => '1234',
+            'status' => ResetPasswordAttempt::STATUS_VALIDATED,
+            'expires_at' => now()->subSecond(),
+        ]);
+
+        $this->postJson('/api/password/reset', [
+            'email' => 'ada@example.com',
+            'codigo' => '1234',
+            'password' => 'NewSecret!456',
+            'password_confirmation' => 'NewSecret!456',
+        ])->assertUnprocessable()
+            ->assertJsonValidationErrors('codigo');
+
+        $this->assertTrue(Hash::check('OldSecret!123', $user->fresh()->password));
+        $this->assertSame(ResetPasswordAttempt::STATUS_EXPIRED, $attempt->fresh()->status);
+    }
+
    public function test_it_validates_password_confirmation_and_strength(): void
    {
        $this->postJson('/api/password/reset', [
--- a/tests/Feature/Auth/ValidateResetPasswordAttemptControllerTest.php
+++ b/tests/Feature/Auth/ValidateResetPasswordAttemptControllerTest.php
@@ -49,6 +49,27 @@ class ValidateResetPasswordAttemptControllerTest extends TestCase
        );
    }

+    public function test_it_expires_an_attempt_and_returns_the_expired_code_message(): void
+    {
+        $user = User::factory()->create(['email' => 'ada@example.com']);
+        $attempt = $user->resetPasswordAttempts()->create([
+            'codigo' => '1234',
+            'expires_at' => now()->subSecond(),
+        ]);
+
+        $this->postJson('/api/password/reset-attempts/validate', [
+            'email' => 'ada@example.com',
+            'codigo' => '1234',
+        ])->assertUnprocessable()
+            ->assertJsonValidationErrors('codigo')
+            ->assertJsonPath('errors.codigo.0', __('api.auth.reset_code_expired'));
+
+        $this->assertSame(
+            ResetPasswordAttempt::STATUS_EXPIRED,
+            $attempt->fresh()->status,
+        );
+    }
+
    public function test_it_rejects_an_expired_or_already_validated_attempt(): void
    {
        $user = User::factory()->create(['email' => 'ada@example.com']);
--- a/tests/Feature/Cart/CartControllerTest.php
+++ b/tests/Feature/Cart/CartControllerTest.php
@@ -5,10 +5,12 @@ namespace Tests\Feature\Cart;
 use App\Domains\Attachable\Enums\AttachmentType;
 use App\Domains\Attachable\Models\Attachment;
 use App\Domains\Auth\Models\User;
+use App\Domains\Cart\Models\Cart;
 use App\Domains\Catalog\Enums\InventoryPolicy;
 use App\Domains\Catalog\Models\CatalogItem;
 use App\Domains\Catalog\Models\Inventory;
 use App\Domains\Catalog\Models\Variant;
+use App\Domains\Catalog\Services\CatalogService;
 use App\Domains\Purchase\Models\Purchase;
 use App\Domains\Purchase\Models\PurchaseItem;
 use App\Domains\Tenant\Models\Tenant;
@@ -28,6 +30,81 @@ class CartControllerTest extends TestCase
        ]));
        $this->assertFalse(Schema::hasColumn('carrito_items', 'buyable_type'));
        $this->assertFalse(Schema::hasColumn('carrito_items', 'buyable_id'));
+        $this->assertTrue(Schema::hasColumns('stock_reservations', [
+            'status',
+            'expires_at',
+            'committed_at',
+            'released_at',
+            'expired_at',
+            'release_reason',
+        ]));
+        $this->assertFalse(Schema::hasColumn('stock_reservations', 'quantity'));
+        $this->assertTrue(Schema::hasColumns('stock_reservation_lines', [
+            'stock_reservation_id',
+            'inventory_id',
+            'quantity',
+            'tracks_inventory',
+        ]));
+        $this->assertTrue(Schema::hasColumn('carritos', 'current_stock_reservation_id'));
+        $this->assertTrue(Schema::hasColumn('compras', 'stock_reservation_id'));
+        $this->assertFalse(Schema::hasColumn('compras', 'expires_at'));
+    }
+
+    public function test_it_aggregates_shared_inventory_into_one_cart_reservation_line(): void
+    {
+        $tenant = $this->createTenant('acme');
+        $firstItem = $this->createDirectItem($tenant, 10, '10.00');
+        $secondItem = app(CatalogService::class)->create([
+            'tenant_code' => $tenant->codigo,
+            'type' => 'bundle',
+            'slug' => 'second-shared-item',
+            'nombre' => 'Second shared item',
+            'precio' => '20.00',
+            'components' => [[
+                'catalog_item_id' => $firstItem->id,
+                'quantity' => 1,
+            ]],
+        ]);
+
+        $firstResponse = $this->postJson('/api/tenants/acme/cart/items', [
+            'catalog_item_id' => $firstItem->id,
+            'cantidad' => 2,
+        ])->assertOk();
+        $guestToken = $firstResponse->getCookie('guest_token', false)?->getValue();
+
+        $this->call(
+            'POST',
+            '/api/tenants/acme/cart/items',
+            [],
+            ['guest_token' => $guestToken],
+            [],
+            ['HTTP_Accept' => 'application/json', 'CONTENT_TYPE' => 'application/json'],
+            json_encode([
+                'catalog_item_id' => $secondItem->id,
+                'cantidad' => 3,
+            ]),
+        )->assertOk();
+
+        $reservationId = (int) $firstResponse->json('data.id');
+        $reservationId = (int) Cart::query()
+            ->findOrFail($reservationId)
+            ->current_stock_reservation_id;
+
+        $this->assertDatabaseCount('stock_reservations', 1);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $reservationId,
+            'status' => 'active',
+        ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'stock_reservation_id' => $reservationId,
+            'inventory_id' => $firstItem->inventory_id,
+            'quantity' => 5,
+        ]);
+        $this->assertDatabaseCount('stock_reservation_lines', 1);
+        $this->assertDatabaseHas('inventories', [
+            'id' => $firstItem->inventory_id,
+            'reserved_stock' => 5,
+        ]);
    }

    public function test_it_adds_a_catalog_item_without_a_variant(): void
@@ -74,9 +151,11 @@ class CartControllerTest extends TestCase
            'id' => $item->inventory_id,
            'reserved_stock' => 2,
        ]);
-        $this->assertDatabaseHas('stock_reservations', [
+        $this->assertDatabaseHas('stock_reservation_lines', [
            'inventory_id' => $item->inventory_id,
            'quantity' => 2,
+        ]);
+        $this->assertDatabaseHas('stock_reservations', [
            'status' => 'active',
        ]);
    }
@@ -96,38 +175,44 @@ class CartControllerTest extends TestCase
        ])->assertOk();

        $this->assertDatabaseHas('stock_reservations', [
-            'inventory_id' => $item->inventory_id,
-            'quantity' => 2,
            'status' => 'active',
            'expires_at' => $now->copy()->addMinutes(45)->toDateTimeString(),
        ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'inventory_id' => $item->inventory_id,
+            'quantity' => 2,
+        ]);

        $this->travelBack();
    }

-    public function test_it_expires_abandoned_cart_reservations_and_removes_empty_carts(): void
+    public function test_it_expires_a_cart_reservation_and_automatically_replaces_the_cart(): void
    {
        config()->set('catalog.stock_reservation_expiration_minutes', 30);
        $tenant = $this->createTenant('acme');
+        $user = User::factory()->create();
        $item = $this->createDirectItem($tenant, 10, '49.90');

-        $response = $this->postJson('/api/tenants/acme/cart/items', [
-            'catalog_item_id' => $item->id,
-            'cantidad' => 2,
-        ])->assertOk();
+        $response = $this->actingAs($user, 'sanctum')
+            ->postJson('/api/tenants/acme/cart/items', [
+                'catalog_item_id' => $item->id,
+                'cantidad' => 2,
+            ])->assertOk();
        $cartId = $response->json('data.id');
        $cartItemId = $response->json('data.items.0.id');
+        $cart = Cart::query()->findOrFail($cartId);
+        $reservationId = $cart->current_stock_reservation_id;

        $this->artisan('reservations:expire')
            ->expectsOutput('Expired purchases: 0')
-            ->expectsOutput('Expired cart items: 0')
+            ->expectsOutput('Expired cart reservations: 0')
            ->assertSuccessful();

        $this->travel(31)->minutes();

        $this->artisan('reservations:expire')
            ->expectsOutput('Expired purchases: 0')
-            ->expectsOutput('Expired cart items: 1')
+            ->expectsOutput('Expired cart reservations: 1')
            ->assertSuccessful();

        $this->assertDatabaseHas('inventories', [
@@ -135,28 +220,141 @@ class CartControllerTest extends TestCase
            'real_stock' => 10,
            'reserved_stock' => 0,
        ]);
-        $this->assertDatabaseMissing('carrito_items', ['id' => $cartItemId]);
-        $this->assertSoftDeleted('carritos', [
+        $this->assertDatabaseHas('carrito_items', ['id' => $cartItemId]);
+        $this->assertDatabaseHas('carritos', [
            'id' => $cartId,
-            'status' => 'expired',
+            'status' => Cart::STATUS_EXPIRED,
+            'current_stock_reservation_id' => $reservationId,
+            'deleted_at' => null,
        ]);
        $this->assertDatabaseHas('stock_reservations', [
-            'inventory_id' => $item->inventory_id,
-            'cart_item_id' => null,
-            'purchase_id' => null,
-            'quantity' => 0,
+            'id' => $reservationId,
            'status' => 'expired',
            'expires_at' => null,
        ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'inventory_id' => $item->inventory_id,
+            'quantity' => 2,
+        ]);
+
+        $currentCart = $this->getJson('/api/tenants/acme/cart')
+            ->assertOk()
+            ->assertJsonPath('data.status', Cart::STATUS_ACTIVE)
+            ->assertJsonPath('data.items', [])
+            ->assertJsonMissingPath('data.stock_reservation')
+            ->assertJsonMissingPath('data.current_stock_reservation_id');
+        $newCartId = $currentCart->json('data.id');
+
+        $this->assertNotSame($cartId, $newCartId);
+        $this->assertDatabaseHas('carritos', [
+            'id' => $cartId,
+            'status' => Cart::STATUS_ABANDONED,
+            'current_stock_reservation_id' => $reservationId,
+        ]);
+        $this->assertDatabaseHas('carritos', [
+            'id' => $newCartId,
+            'status' => Cart::STATUS_ACTIVE,
+            'current_stock_reservation_id' => null,
+        ]);
+
+        $this->postJson('/api/tenants/acme/cart/items', [
+            'catalog_item_id' => $item->id,
+            'cantidad' => 1,
+        ])
+            ->assertOk()
+            ->assertJsonPath('data.id', $newCartId)
+            ->assertJsonPath('data.items.0.cantidad', 1);

        $this->artisan('reservations:expire')
            ->expectsOutput('Expired purchases: 0')
-            ->expectsOutput('Expired cart items: 0')
+            ->expectsOutput('Expired cart reservations: 0')
            ->assertSuccessful();

        $this->travelBack();
    }

+    public function test_it_replaces_an_overdue_cart_before_the_expiration_job_runs(): void
+    {
+        config()->set('catalog.stock_reservation_expiration_minutes', 30);
+        $tenant = $this->createTenant('acme');
+        $user = User::factory()->create();
+        $item = $this->createDirectItem($tenant, 10, '49.90');
+
+        $original = $this->actingAs($user, 'sanctum')
+            ->postJson('/api/tenants/acme/cart/items', [
+                'catalog_item_id' => $item->id,
+                'cantidad' => 2,
+            ])->assertOk();
+        $originalCartId = $original->json('data.id');
+
+        $this->travel(31)->minutes();
+
+        $replacement = $this->postJson('/api/tenants/acme/cart/items', [
+            'catalog_item_id' => $item->id,
+            'cantidad' => 1,
+        ])
+            ->assertOk()
+            ->assertJsonPath('data.status', Cart::STATUS_ACTIVE)
+            ->assertJsonPath('data.items.0.cantidad', 1);
+
+        $this->assertNotSame($originalCartId, $replacement->json('data.id'));
+        $this->assertDatabaseHas('carritos', [
+            'id' => $originalCartId,
+            'status' => Cart::STATUS_ABANDONED,
+        ]);
+        $this->assertDatabaseHas('inventories', [
+            'id' => $item->inventory_id,
+            'reserved_stock' => 1,
+        ]);
+
+        $this->travelBack();
+    }
+
+    public function test_expired_cart_mutations_return_the_expiration_error_instead_of_not_found(): void
+    {
+        config()->set('catalog.stock_reservation_expiration_minutes', 30);
+        $tenant = $this->createTenant('acme');
+        $user = User::factory()->create();
+        [$item, $firstVariant] = $this->createVariantItem($tenant, 10, '49.90');
+        $secondInventory = Inventory::query()->create(['real_stock' => 10]);
+        $secondVariant = $item->variants()->create(['inventory_id' => $secondInventory->id]);
+
+        $cartItemId = $this->actingAs($user, 'sanctum')
+            ->postJson('/api/tenants/acme/cart/items', [
+                'catalog_item_id' => $item->id,
+                'variant_id' => $firstVariant->id,
+                'cantidad' => 2,
+            ])
+            ->assertOk()
+            ->json('data.items.0.id');
+
+        $this->travel(31)->minutes();
+
+        $expectedError = [
+            'code' => 'stock_reservation.expired',
+            'message' => __('api.cart.reservation_expired'),
+        ];
+
+        $this->patchJson("/api/tenants/acme/cart/items/{$cartItemId}", [
+            'cantidad' => 3,
+        ])
+            ->assertUnprocessable()
+            ->assertExactJson($expectedError);
+
+        $this->patchJson("/api/tenants/acme/cart/items/{$cartItemId}", [
+            'cantidad' => 2,
+            'variant_id' => $secondVariant->id,
+        ])
+            ->assertUnprocessable()
+            ->assertExactJson($expectedError);
+
+        $this->deleteJson("/api/tenants/acme/cart/items/{$cartItemId}")
+            ->assertUnprocessable()
+            ->assertExactJson($expectedError);
+
+        $this->travelBack();
+    }
+
    public function test_it_filters_item_images_when_the_tenant_disables_them(): void
    {
        $tenant = $this->createTenant('acme');
@@ -212,10 +410,11 @@ class CartControllerTest extends TestCase
            'id' => $variant->inventory_id,
            'reserved_stock' => 5,
        ]);
-        $this->assertDatabaseHas('stock_reservations', [
-            'cart_item_id' => $response->json('data.items.0.id'),
+        $this->assertDatabaseHas('stock_reservation_lines', [
            'inventory_id' => $variant->inventory_id,
            'quantity' => 5,
+        ]);
+        $this->assertDatabaseHas('stock_reservations', [
            'status' => 'active',
        ]);
    }
@@ -229,6 +428,7 @@ class CartControllerTest extends TestCase
        $this->createPurchaseItem($tenant, $user, $item, 1);

        $this->actingAs($user, 'sanctum')
+            ->withHeader('Accept-Language', 'es')
            ->postJson('/api/tenants/acme/cart/items', [
                'catalog_item_id' => $item->id,
                'cantidad' => 2,
@@ -237,6 +437,7 @@ class CartControllerTest extends TestCase
            ->assertJsonPath('data.items.0.cantidad', 2);

        $this->actingAs($user, 'sanctum')
+            ->withHeader('Accept-Language', 'es')
            ->postJson('/api/tenants/acme/cart/items', [
                'catalog_item_id' => $item->id,
                'cantidad' => 2,
@@ -381,10 +582,12 @@ class CartControllerTest extends TestCase
            'reserved_stock' => 0,
        ]);
        $this->assertDatabaseHas('stock_reservations', [
-            'cart_item_id' => null,
-            'inventory_id' => $variant->inventory_id,
-            'quantity' => 0,
            'status' => 'released',
+            'release_reason' => 'cart_empty',
+        ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'inventory_id' => $variant->inventory_id,
+            'quantity' => 5,
        ]);
    }

--- a/tests/Feature/Integration/TelepagosWebhookTest.php
+++ b/tests/Feature/Integration/TelepagosWebhookTest.php
@@ -60,8 +60,12 @@ class TelepagosWebhookTest extends TestCase
            ->assertJsonValidationErrors(['transfer_payer_dni']);
    }

-    public function test_transfer_payment_intent_persists_transfer_payer_dni_without_replacing_customer_dni(): void
+    public function test_transfer_payment_intent_persists_data_without_extending_checkout_expiration(): void
    {
+        config()->set('purchase.checkout_expiration_minutes', 30);
+        $now = now()->startOfSecond();
+        $this->travelTo($now);
+
        $tenant = $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
        $this->configureTelepagosIntegration($tenant);
        $user = User::factory()->create();
@@ -99,6 +103,13 @@ class TelepagosWebhookTest extends TestCase
            'payment_method' => 'transfer',
            'status' => Purchase::STATUS_PENDING_PAYMENT,
        ]);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $purchase->stock_reservation_id,
+            'status' => 'active',
+            'expires_at' => $now->copy()->addMinutes(30)->toDateTimeString(),
+        ]);
+
+        $this->travelBack();
    }

    public function test_transfer_webhook_matches_pending_purchase_by_dni_and_total_amount(): void
@@ -198,11 +209,16 @@ class TelepagosWebhookTest extends TestCase
            'compra_id' => $newerPurchase->id,
            'cantidad' => 2,
        ]);
+        $newerReservationId = $newerPurchase->fresh()->stock_reservation_id;
+        $this->assertNotNull($newerReservationId);
        $this->assertDatabaseHas('stock_reservations', [
-            'purchase_id' => $newerPurchase->id,
+            'id' => $newerReservationId,
+            'status' => 'active',
+        ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'stock_reservation_id' => $newerReservationId,
            'inventory_id' => $variant->inventory_id,
            'quantity' => 2,
-            'status' => 'active',
        ]);

        $this->assertSoftDeleted('carritos', [
@@ -325,8 +341,9 @@ class TelepagosWebhookTest extends TestCase
            ->firstOrFail();
        $this->assertEqualsCanonicalizing(
            [$firstPurchase->id, $secondPurchase->id, $thirdPurchase->id],
-            $payment->matched_purchase_ids,
+            $payment->candidates()->pluck('compra_id')->all(),
        );
+        $this->assertSame(3, $payment->candidates()->where('match_reason', 'ambiguous_exact_match')->count());
        $this->assertDatabaseHas('compras', [
            'id' => $firstPurchase->id,
            'status' => Purchase::STATUS_PENDING_PAYMENT,
@@ -341,6 +358,183 @@ class TelepagosWebhookTest extends TestCase
        ]);
    }

+    public function test_transfer_webhook_records_near_amount_only_with_exact_dni_or_exact_amount_with_different_dni(): void
+    {
+        config(['purchase.transfer_candidate_amount_tolerance_percentage' => 5]);
+
+        $tenant = $this->createTenant('candidates', 'Candidates', 'candidates.com.ar');
+        $this->configureTelepagosIntegration($tenant);
+
+        $nearAmountVariant = $this->createVariantForTenant('candidates', 10, '52.00', 'near');
+        $exactAmountVariant = $this->createVariantForTenant('candidates', 10, '50.00', 'exact');
+        $distanceTwoExactAmountVariant = $this->createVariantForTenant('candidates', 10, '50.00', 'distance-two');
+        $farExactAmountVariant = $this->createVariantForTenant('candidates', 10, '50.00', 'far-exact');
+        $nearAmountDifferentDniVariant = $this->createVariantForTenant('candidates', 10, '51.00', 'near-other-dni');
+        $outsideRangeVariant = $this->createVariantForTenant('candidates', 10, '100.00', 'outside');
+
+        $nearAmountPurchase = $this->createPendingTransferPurchase(
+            $tenant,
+            User::factory()->create()->id,
+            $nearAmountVariant->id,
+            1,
+            '12345678',
+        );
+        $exactAmountDifferentDniPurchase = $this->createPendingTransferPurchase(
+            $tenant,
+            User::factory()->create()->id,
+            $exactAmountVariant->id,
+            1,
+            '12345687',
+        );
+        $farExactAmountDifferentDniPurchase = $this->createPendingTransferPurchase(
+            $tenant,
+            User::factory()->create()->id,
+            $farExactAmountVariant->id,
+            1,
+            '87654321',
+        );
+        $distanceTwoExactAmountPurchase = $this->createPendingTransferPurchase(
+            $tenant,
+            User::factory()->create()->id,
+            $distanceTwoExactAmountVariant->id,
+            1,
+            '12345087',
+        );
+        $nearAmountDifferentDniPurchase = $this->createPendingTransferPurchase(
+            $tenant,
+            User::factory()->create()->id,
+            $nearAmountDifferentDniVariant->id,
+            1,
+            '87654321',
+        );
+        $outsideRangePurchase = $this->createPendingTransferPurchase(
+            $tenant,
+            User::factory()->create()->id,
+            $outsideRangeVariant->id,
+            1,
+            '12345678',
+        );
+
+        Http::fake([
+            'https://api.telepagos.com.ar/v2/auth/token' => Http::response([
+                'status' => 'ok',
+                'token' => 'test-token',
+                'expires_at' => now()->addHour()->toIso8601String(),
+            ]),
+            'https://api.telepagos.com.ar/v2/payment/cashin/candidates' => Http::response([
+                'status' => 'ok',
+                'data' => [
+                    'amount' => 50,
+                    'operation_id' => 1,
+                    'transaction_id' => 'tx-candidates',
+                    'buyer' => ['cuit' => '20123456789'],
+                ],
+            ]),
+        ]);
+
+        $this->postJson('/api/webhooks/telepagos/candidates', ['id' => 'candidates'])
+            ->assertOk()
+            ->assertJsonPath('status', 'success');
+
+        $payment = TelepagosPayment::query()
+            ->where('transaction_id', 'tx-candidates')
+            ->firstOrFail();
+
+        $this->assertNull($payment->compra_id);
+        $this->assertEqualsCanonicalizing([
+            $nearAmountPurchase->id,
+            $exactAmountDifferentDniPurchase->id,
+            $distanceTwoExactAmountPurchase->id,
+        ], $payment->candidates()->pluck('compra_id')->all());
+        $this->assertDatabaseHas('telepagos_payment_candidates', [
+            'telepagos_payment_id' => $payment->id,
+            'compra_id' => $nearAmountPurchase->id,
+            'dni_matches' => true,
+            'dni_distance' => 0,
+            'payment_dni' => '12345678',
+            'purchase_dni' => '12345678',
+            'amount_matches' => false,
+            'payment_amount' => 50,
+            'purchase_amount' => 52,
+            'amount_difference' => 2,
+            'match_reason' => 'exact_dni_near_amount',
+            'confidence' => 'high',
+        ]);
+        $this->assertDatabaseHas('telepagos_payment_candidates', [
+            'telepagos_payment_id' => $payment->id,
+            'compra_id' => $exactAmountDifferentDniPurchase->id,
+            'dni_matches' => false,
+            'dni_distance' => 1,
+            'payment_dni' => '12345678',
+            'purchase_dni' => '12345687',
+            'amount_matches' => true,
+            'payment_amount' => 50,
+            'purchase_amount' => 50,
+            'amount_difference' => 0,
+            'match_reason' => 'exact_amount_near_dni',
+            'confidence' => 'medium',
+        ]);
+        $this->assertDatabaseHas('telepagos_payment_candidates', [
+            'telepagos_payment_id' => $payment->id,
+            'compra_id' => $distanceTwoExactAmountPurchase->id,
+            'dni_matches' => false,
+            'dni_distance' => 2,
+            'payment_dni' => '12345678',
+            'purchase_dni' => '12345087',
+            'amount_matches' => true,
+            'match_reason' => 'exact_amount_near_dni',
+        ]);
+        $this->assertDatabaseMissing('telepagos_payment_candidates', [
+            'telepagos_payment_id' => $payment->id,
+            'compra_id' => $farExactAmountDifferentDniPurchase->id,
+        ]);
+        $this->assertDatabaseMissing('telepagos_payment_candidates', [
+            'telepagos_payment_id' => $payment->id,
+            'compra_id' => $nearAmountDifferentDniPurchase->id,
+        ]);
+        $this->assertDatabaseMissing('telepagos_payment_candidates', [
+            'telepagos_payment_id' => $payment->id,
+            'compra_id' => $outsideRangePurchase->id,
+        ]);
+        $this->assertSame(Purchase::STATUS_PENDING_PAYMENT, $nearAmountPurchase->fresh()->status);
+        $this->assertSame(Purchase::STATUS_PENDING_PAYMENT, $exactAmountDifferentDniPurchase->fresh()->status);
+
+        $higherPriorityPayment = TelepagosPayment::query()->create([
+            'cuit_buyer' => '20123456789',
+            'amount' => 52,
+            'operation_id' => 1,
+            'transaction_id' => 'tx-primary-candidate',
+        ]);
+        $higherPriorityPayment->candidates()->create([
+            'compra_id' => $nearAmountPurchase->id,
+            'dni_matches' => true,
+            'dni_distance' => 0,
+            'payment_dni' => '12345678',
+            'purchase_dni' => '12345678',
+            'amount_matches' => true,
+            'payment_amount' => 52,
+            'purchase_amount' => 52,
+            'amount_difference' => 0,
+            'match_reason' => 'ambiguous_exact_match',
+            'confidence' => 'exact',
+        ]);
+
+        app(CheckoutService::class)->submitForReview($nearAmountPurchase->fresh());
+        $buyer = User::query()->findOrFail($nearAmountPurchase->user_id);
+
+        $this->actingAs($buyer, 'sanctum')
+            ->getJson("/api/tenants/candidates/compras/{$nearAmountPurchase->id}")
+            ->assertOk()
+            ->assertJsonPath('data.status', Purchase::STATUS_IN_REVIEW)
+            ->assertJsonPath('data.payment_verification.status', 'candidate')
+            ->assertJsonPath('data.payment_verification.candidate_count', 2)
+            ->assertJsonPath('data.payment_verification.primary.reason', 'ambiguous_exact_match')
+            ->assertJsonPath('data.payment_verification.primary.amount_difference', '0.00')
+            ->assertJsonPath('data.payment_verification.primary.confidence', 'exact')
+            ->assertJsonPath('data.payment_verification.reasons.0', 'ambiguous_exact_match')
+            ->assertJsonPath('data.payment_verification.reasons.1', 'exact_dni_near_amount');
+    }
+
    public function test_webhook_confirms_a_purchase_with_tickets_enabled(): void
    {
        $tenant = $this->createTenant('expired-ticket', 'Expired Ticket', 'expired-ticket.com.ar');
--- a/tests/Feature/Purchase/StorePurchaseTest.php
+++ b/tests/Feature/Purchase/StorePurchaseTest.php
@@ -32,6 +32,82 @@ class StorePurchaseTest extends TestCase
        Queue::fake();
    }

+    public function test_checkout_keeps_the_cart_reservation_and_refreshes_its_expiration(): void
+    {
+        config()->set('catalog.stock_reservation_expiration_minutes', 5);
+        config()->set('purchase.checkout_expiration_minutes', 30);
+        $now = now()->startOfSecond();
+        $this->travelTo($now);
+
+        $tenant = $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
+        $user = User::factory()->create();
+        $variant = $this->createVariantForTenant('sonder', 10, '50.00');
+        $cart = Cart::query()->create([
+            'tenant_codigo' => $tenant->codigo,
+            'user_id' => $user->id,
+            'status' => 'active',
+        ]);
+        $cart->addItem($variant->catalog_item_id, $variant->id, 2);
+        $reservationId = $cart->fresh()->current_stock_reservation_id;
+
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $reservationId,
+            'status' => 'active',
+            'expires_at' => $now->copy()->addMinutes(5)->toDateTimeString(),
+        ]);
+
+        $this->travel(2)->minutes();
+        $purchase = app(CheckoutService::class)->startCheckout($tenant, $user->id, [
+            'cart_id' => $cart->id,
+        ]);
+
+        $this->assertSame($reservationId, $purchase->stock_reservation_id);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $reservationId,
+            'status' => 'active',
+            'expires_at' => $now->copy()->addMinutes(32)->toDateTimeString(),
+        ]);
+
+        $this->travelBack();
+    }
+
+    public function test_checkout_cannot_replace_an_overdue_cart_reservation(): void
+    {
+        $tenant = $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
+        $user = User::factory()->create();
+        $variant = $this->createVariantForTenant('sonder', 10, '50.00');
+        $cart = Cart::query()->create([
+            'tenant_codigo' => $tenant->codigo,
+            'user_id' => $user->id,
+            'status' => 'active',
+        ]);
+        $cart->addItem($variant->catalog_item_id, $variant->id, 2);
+        $reservationId = $cart->fresh()->current_stock_reservation_id;
+        $expiredAt = now()->subMinute()->startOfSecond();
+        $cart->currentStockReservation()->update(['expires_at' => $expiredAt]);
+
+        $this->actingAs($user, 'sanctum')
+            ->postJson('/api/tenants/sonder/compras/start-checkout', [
+                'cart_id' => $cart->id,
+            ])
+            ->assertUnprocessable()
+            ->assertExactJson([
+                'code' => 'stock_reservation.expired',
+                'message' => __('api.cart.reservation_expired'),
+            ]);
+
+        $this->assertDatabaseCount('compras', 0);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $reservationId,
+            'status' => 'active',
+            'expires_at' => $expiredAt->toDateTimeString(),
+        ]);
+        $this->assertDatabaseHas('carritos', [
+            'id' => $cart->id,
+            'current_stock_reservation_id' => $reservationId,
+        ]);
+    }
+
    public function test_it_starts_checkout_from_cart_with_purchase_item_snapshots(): void
    {
        $tenant = $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
@@ -119,12 +195,7 @@ class StorePurchaseTest extends TestCase
            'precio_unitario' => '50.00',
            'total' => '100.00',
        ]);
-        $this->assertDatabaseHas('stock_reservations', [
-            'inventory_id' => $inventory->id,
-            'purchase_id' => $purchaseId,
-            'quantity' => 2,
-            'status' => 'active',
-        ]);
+        $this->assertPurchaseReservation($purchaseId, $inventory->id, 2, 'active');
        $this->assertDatabaseHas('carritos', [
            'id' => $cartId,
            'user_id' => $user->id,
@@ -168,12 +239,7 @@ class StorePurchaseTest extends TestCase
            'id' => $cartId,
            'current_purchase_id' => $replacementPurchaseId,
        ]);
-        $this->assertDatabaseHas('stock_reservations', [
-            'inventory_id' => $inventory->id,
-            'purchase_id' => $replacementPurchaseId,
-            'quantity' => 2,
-            'status' => 'active',
-        ]);
+        $this->assertPurchaseReservation($replacementPurchaseId, $inventory->id, 2, 'active');
        $this->assertDatabaseHas('inventories', [
            'id' => $inventory->id,
            'reserved_stock' => 2,
@@ -227,12 +293,7 @@ class StorePurchaseTest extends TestCase
            'precio_unitario' => '50.00',
            'total' => '150.00',
        ]);
-        $this->assertDatabaseHas('stock_reservations', [
-            'inventory_id' => $variant->inventory_id,
-            'purchase_id' => $response->json('data.id'),
-            'quantity' => 3,
-            'status' => 'active',
-        ]);
+        $this->assertPurchaseReservation($response->json('data.id'), $variant->inventory_id, 3, 'active');
        $this->assertDatabaseHas('inventories', [
            'id' => $variant->inventory_id,
            'real_stock' => 10,
@@ -244,10 +305,7 @@ class StorePurchaseTest extends TestCase
            ->assertOk()
            ->assertJsonPath('data.status', Purchase::STATUS_CANCELLED);

-        $this->assertDatabaseHas('stock_reservations', [
-            'purchase_id' => $response->json('data.id'),
-            'status' => 'released',
-        ]);
+        $this->assertPurchaseReservation($response->json('data.id'), $variant->inventory_id, 3, 'released');
        $this->assertDatabaseHas('inventories', [
            'id' => $variant->inventory_id,
            'real_stock' => 10,
@@ -296,18 +354,8 @@ class StorePurchaseTest extends TestCase
            'origin' => Cart::ORIGIN_DIRECT_CHECKOUT,
        ]);
        $this->assertDatabaseCount('compra_items', 2);
-        $this->assertDatabaseHas('stock_reservations', [
-            'inventory_id' => $firstVariant->inventory_id,
-            'purchase_id' => $purchaseId,
-            'quantity' => 1,
-            'status' => 'active',
-        ]);
-        $this->assertDatabaseHas('stock_reservations', [
-            'inventory_id' => $secondVariant->inventory_id,
-            'purchase_id' => $purchaseId,
-            'quantity' => 1,
-            'status' => 'active',
-        ]);
+        $this->assertPurchaseReservation($purchaseId, $firstVariant->inventory_id, 1, 'active');
+        $this->assertPurchaseReservation($purchaseId, $secondVariant->inventory_id, 1, 'active');
        $this->assertDatabaseHas('inventories', [
            'id' => $firstVariant->inventory_id,
            'reserved_stock' => 1,
@@ -430,7 +478,7 @@ class StorePurchaseTest extends TestCase
        $tenant = $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
        $user = User::factory()->create();
        $firstVariant = $this->createVariantForTenant('sonder', 20, '50.00');
-        $firstVariant->catalogItem->update(['max_units_per_user' => 3]);
+        $firstVariant->catalogItem->update(['max_units_per_user' => 4]);
        $secondInventory = Inventory::query()->create(['real_stock' => 20]);
        $secondVariant = Variant::query()->create([
            'catalog_item_id' => $firstVariant->catalog_item_id,
@@ -443,6 +491,7 @@ class StorePurchaseTest extends TestCase
        ]);
        $cart->addItem($firstVariant->catalog_item_id, $firstVariant->id, 2);
        $cart->addItem($secondVariant->catalog_item_id, $secondVariant->id, 2);
+        $firstVariant->catalogItem->update(['max_units_per_user' => 3]);

        $this->actingAs($user, 'sanctum')
            ->postJson('/api/tenants/sonder/compras/start-checkout', [
@@ -468,6 +517,7 @@ class StorePurchaseTest extends TestCase
        $user = User::factory()->create();
        $variant = $this->createVariantForTenant('sonder', 10, '50.00');
        $purchase = $this->createCheckoutPurchase($user, 'sonder', $variant, 3);
+        $reservationId = $purchase->stock_reservation_id;
        $activeCart = Cart::query()
            ->where('user_id', $user->id)
            ->where('status', 'active')
@@ -500,27 +550,36 @@ class StorePurchaseTest extends TestCase
            'id' => $variant->inventory_id,
            'reserved_stock' => 3,
        ]);
+        $activeCart->refresh();
+        $this->assertSame($reservationId, $activeCart->current_stock_reservation_id);
+        $this->assertDatabaseHas('compras', [
+            'id' => $purchase->id,
+            'stock_reservation_id' => null,
+        ]);
        $this->assertDatabaseHas('stock_reservations', [
-            'cart_item_id' => $cartItemId,
-            'purchase_id' => null,
-            'quantity' => 3,
+            'id' => $activeCart->current_stock_reservation_id,
            'status' => 'active',
        ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'stock_reservation_id' => $activeCart->current_stock_reservation_id,
+            'inventory_id' => $variant->inventory_id,
+            'quantity' => 3,
+        ]);
        $this->assertSame(1, $activeCart->items()->count());
    }

-    public function test_it_reassigns_a_terminal_purchase_reservation_and_rejects_a_late_confirmation(): void
+    public function test_it_reuses_the_cart_reservation_for_a_new_checkout_and_rejects_a_late_confirmation(): void
    {
        $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
        $user = User::factory()->create();
        $variant = $this->createVariantForTenant('sonder', 10, '50.00');
        $previousPurchase = $this->createCheckoutPurchase($user, 'sonder', $variant, 2);
        $cart = $previousPurchase->cart;
+        $previousReservationId = $previousPurchase->stock_reservation_id;

        $previousPurchase->update([
            'status' => Purchase::STATUS_PENDING_PAYMENT,
            'payment_method' => 'transfer',
-            'expires_at' => now()->addMinutes(30),
        ]);

        $currentPurchase = app(CheckoutService::class)->startCheckout(
@@ -532,17 +591,22 @@ class StorePurchaseTest extends TestCase
        $this->assertDatabaseHas('compras', [
            'id' => $previousPurchase->id,
            'status' => Purchase::STATUS_SUPERSEDED,
-            'expires_at' => null,
        ]);
        $this->assertDatabaseHas('carritos', [
            'id' => $cart->id,
            'current_purchase_id' => $currentPurchase->id,
        ]);
-        $this->assertDatabaseHas('stock_reservations', [
-            'purchase_id' => $currentPurchase->id,
-            'quantity' => 2,
-            'status' => 'active',
+        $this->assertSame($previousReservationId, $currentPurchase->stock_reservation_id);
+        $this->assertDatabaseHas('compras', [
+            'id' => $previousPurchase->id,
+            'stock_reservation_id' => null,
        ]);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $previousReservationId,
+            'status' => 'active',
+            'release_reason' => null,
+        ]);
+        $this->assertPurchaseReservation($currentPurchase->id, $variant->inventory_id, 2, 'active');

        try {
            app(CheckoutService::class)->confirmPaidPurchase($previousPurchase->fresh());
@@ -556,11 +620,7 @@ class StorePurchaseTest extends TestCase
            'reserved_stock' => 2,
            'sold_units' => 0,
        ]);
-        $this->assertDatabaseHas('stock_reservations', [
-            'purchase_id' => $currentPurchase->id,
-            'quantity' => 2,
-            'status' => 'active',
-        ]);
+        $this->assertPurchaseReservation($currentPurchase->id, $variant->inventory_id, 2, 'active');
    }

    public function test_removing_a_checkout_item_supersedes_the_purchase_and_restores_the_user_quota(): void
@@ -589,11 +649,12 @@ class StorePurchaseTest extends TestCase
            'current_purchase_id' => null,
        ]);
        $this->assertDatabaseHas('stock_reservations', [
-            'inventory_id' => $variant->inventory_id,
-            'cart_item_id' => null,
-            'purchase_id' => null,
-            'quantity' => 0,
            'status' => 'released',
+            'release_reason' => 'cart_empty',
+        ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'inventory_id' => $variant->inventory_id,
+            'quantity' => 2,
        ]);
        $this->assertDatabaseHas('inventories', [
            'id' => $variant->inventory_id,
@@ -607,7 +668,7 @@ class StorePurchaseTest extends TestCase
        $this->assertSame(3, $remaining);
    }

-    public function test_it_expires_the_purchase_without_mutating_the_active_cart(): void
+    public function test_it_expires_the_purchase_and_preserves_the_expired_cart_items(): void
    {
        $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
        $user = User::factory()->create();
@@ -618,7 +679,7 @@ class StorePurchaseTest extends TestCase
            ->where('status', 'active')
            ->firstOrFail();
        $cartItemId = $purchase->cart->items()->firstOrFail()->id;
-        $purchase->update(['expires_at' => now()->subMinute()]);
+        $purchase->stockReservation()->update(['expires_at' => now()->subMinute()]);

        $this->artisan('reservations:expire')->assertSuccessful();

@@ -628,22 +689,60 @@ class StorePurchaseTest extends TestCase
        ]);
        $this->assertDatabaseHas('inventories', [
            'id' => $variant->inventory_id,
-            'reserved_stock' => 3,
+            'reserved_stock' => 0,
        ]);
        $this->assertDatabaseHas('carritos', [
            'id' => $activeCart->id,
            'user_id' => $user->id,
-            'status' => 'active',
+            'status' => Cart::STATUS_EXPIRED,
            'current_purchase_id' => null,
+            'current_stock_reservation_id' => $purchase->stock_reservation_id,
            'deleted_at' => null,
        ]);
+        $this->assertPurchaseReservation($purchase->id, $variant->inventory_id, 3, 'expired');
+        $this->assertSame(1, $activeCart->items()->count());
+
+        $this->actingAs($user, 'sanctum')
+            ->postJson('/api/tenants/sonder/compras/start-checkout', [
+                'cart_id' => $activeCart->id,
+            ])
+            ->assertUnprocessable()
+            ->assertExactJson([
+                'code' => 'stock_reservation.expired',
+                'message' => __('api.cart.reservation_expired'),
+            ]);
+
+        $this->actingAs($user, 'sanctum')
+            ->postJson("/api/tenants/sonder/compras/{$purchase->id}/cancel")
+            ->assertUnprocessable()
+            ->assertJsonPath('code', 'purchase.expired');
+    }
+
+    public function test_an_overdue_purchase_cannot_be_cancelled_before_the_expiration_job_runs(): void
+    {
+        $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
+        $user = User::factory()->create();
+        $variant = $this->createVariantForTenant('sonder', 10, '50.00');
+        $purchase = $this->createCheckoutPurchase($user, 'sonder', $variant, 1);
+        $purchase->stockReservation()->update(['expires_at' => now()->subMinute()]);
+
+        $this->actingAs($user, 'sanctum')
+            ->postJson("/api/tenants/sonder/compras/{$purchase->id}/cancel")
+            ->assertUnprocessable()
+            ->assertExactJson([
+                'code' => 'stock_reservation.expired',
+                'message' => __('api.cart.reservation_expired'),
+            ]);
+
+        $this->assertDatabaseHas('compras', [
+            'id' => $purchase->id,
+            'status' => Purchase::STATUS_CREATED,
+            'stock_reservation_id' => $purchase->stock_reservation_id,
+        ]);
        $this->assertDatabaseHas('stock_reservations', [
-            'cart_item_id' => $cartItemId,
-            'purchase_id' => null,
-            'quantity' => 3,
+            'id' => $purchase->stock_reservation_id,
            'status' => 'active',
        ]);
-        $this->assertSame(1, $activeCart->items()->count());
    }

    public function test_it_keeps_cart_items_during_checkout_and_updates_customer_data(): void
@@ -697,12 +796,18 @@ class StorePurchaseTest extends TestCase

    public function test_it_updates_customer_data_for_a_pending_payment_purchase(): void
    {
+        config()->set('purchase.checkout_expiration_minutes', 30);
+        $now = now()->startOfSecond();
+        $this->travelTo($now);
+
        $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
        $user = User::factory()->create();
        $variant = $this->createVariantForTenant('sonder', 10, '50.00');
        $purchase = $this->createCheckoutPurchase($user, 'sonder', $variant, 1);
        $purchase->update(['status' => Purchase::STATUS_PENDING_PAYMENT]);

+        $this->travel(10)->minutes();
+
        $this->actingAs($user, 'sanctum')
            ->patchJson("/api/tenants/sonder/compras/{$purchase->id}/customer-data", [
                'dni' => '987654321',
@@ -719,6 +824,12 @@ class StorePurchaseTest extends TestCase
            'status' => Purchase::STATUS_PENDING_PAYMENT,
            'dni' => '987654321',
        ]);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $purchase->stock_reservation_id,
+            'expires_at' => $now->copy()->addMinutes(30)->toDateTimeString(),
+        ]);
+
+        $this->travelBack();
    }

    public function test_checkout_items_are_immutable_and_editing_routes_are_unavailable(): void
@@ -848,7 +959,6 @@ class StorePurchaseTest extends TestCase
        $purchase->update([
            'payment_method' => 'transfer',
            'status' => Purchase::STATUS_PENDING_PAYMENT,
-            'expires_at' => now()->addMinutes(30),
        ]);

        $url = "/api/tenants/sonder/compras/{$purchase->id}/review";
@@ -862,6 +972,10 @@ class StorePurchaseTest extends TestCase
        $this->assertDatabaseHas('compras', [
            'id' => $purchase->id,
            'status' => Purchase::STATUS_IN_REVIEW,
+        ]);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $purchase->stock_reservation_id,
+            'status' => 'active',
            'expires_at' => null,
        ]);

@@ -912,10 +1026,7 @@ class StorePurchaseTest extends TestCase
            'current_purchase_id' => null,
            'deleted_at' => null,
        ]);
-        $this->assertDatabaseHas('stock_reservations', [
-            'purchase_id' => $purchase->id,
-            'status' => 'active',
-        ]);
+        $this->assertPurchaseReservation($purchase->id, $variant->inventory_id, 2, 'active');
    }

    public function test_it_rejects_review_for_a_purchase_that_is_not_awaiting_payment(): void
@@ -936,7 +1047,7 @@ class StorePurchaseTest extends TestCase
        ]);
    }

-    public function test_it_expires_an_abandoned_purchase_without_mutating_its_active_cart(): void
+    public function test_it_expires_a_purchase_and_its_associated_cart(): void
    {
        $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
        $user = User::factory()->create();
@@ -947,7 +1058,7 @@ class StorePurchaseTest extends TestCase
            ->where('status', 'active')
            ->firstOrFail();

-        $this->assertNotNull($purchase->expires_at);
+        $this->assertNotNull($purchase->stockReservation->expires_at);
        $this->assertDatabaseHas('inventories', [
            'id' => $variant->inventory_id,
            'reserved_stock' => 3,
@@ -957,7 +1068,7 @@ class StorePurchaseTest extends TestCase

        $this->artisan('reservations:expire')
            ->expectsOutput('Expired purchases: 1')
-            ->expectsOutput('Expired cart items: 0')
+            ->expectsOutput('Expired cart reservations: 0')
            ->assertSuccessful();

        $this->assertDatabaseHas('compras', [
@@ -968,28 +1079,26 @@ class StorePurchaseTest extends TestCase
            'compra_id' => $purchase->id,
            'cantidad' => 3,
        ]);
-        $this->assertDatabaseHas('stock_reservations', [
-            'purchase_id' => null,
-            'quantity' => 3,
-            'status' => 'active',
-        ]);
+        $this->assertPurchaseReservation($purchase->id, $variant->inventory_id, 3, 'expired');
        $this->assertDatabaseHas('inventories', [
            'id' => $variant->inventory_id,
            'real_stock' => 10,
-            'reserved_stock' => 3,
+            'reserved_stock' => 0,
            'sold_units' => 0,
        ]);
        $this->assertDatabaseHas('carritos', [
            'id' => $activeCart->id,
            'user_id' => $user->id,
-            'status' => 'active',
+            'status' => Cart::STATUS_EXPIRED,
+            'current_purchase_id' => null,
+            'current_stock_reservation_id' => $purchase->stock_reservation_id,
            'deleted_at' => null,
        ]);
        $this->assertSame(1, $activeCart->items()->count());

        $this->artisan('reservations:expire')
            ->expectsOutput('Expired purchases: 0')
-            ->expectsOutput('Expired cart items: 0')
+            ->expectsOutput('Expired cart reservations: 0')
            ->assertSuccessful();
    }

@@ -1006,6 +1115,7 @@ class StorePurchaseTest extends TestCase
            'source_catalog_item_id' => $variant->catalog_item_id,
            'source_variant_id' => $variant->id,
            'nombre' => 'Inconsistent item',
+            'item_nombre' => 'Inconsistent item',
            'slug' => 'inconsistent-item',
            'cantidad' => 1,
            'precio_unitario' => '50.00',
@@ -1018,7 +1128,7 @@ class StorePurchaseTest extends TestCase

        $this->artisan('reservations:expire')
            ->expectsOutput('Expired purchases: 2')
-            ->expectsOutput('Expired cart items: 0')
+            ->expectsOutput('Expired cart reservations: 0')
            ->assertSuccessful();

        $this->assertDatabaseHas('compras', [
@@ -1160,12 +1270,7 @@ class StorePurchaseTest extends TestCase
            'reserved_stock' => 0,
            'sold_units' => 2,
        ]);
-        $this->assertDatabaseHas('stock_reservations', [
-            'purchase_id' => $purchase->id,
-            'inventory_id' => $variant->inventory_id,
-            'quantity' => 2,
-            'status' => 'committed',
-        ]);
+        $this->assertPurchaseReservation($purchase->id, $variant->inventory_id, 2, 'committed');

        $this->assertSoftDeleted('carritos', [
            'id' => $purchase->cart_id,
@@ -1440,6 +1545,26 @@ class StorePurchaseTest extends TestCase
        ]);
    }

+    protected function assertPurchaseReservation(
+        int $purchaseId,
+        int $inventoryId,
+        int $quantity,
+        string $status,
+    ): void {
+        $reservationId = Purchase::query()->findOrFail($purchaseId)->stock_reservation_id;
+
+        $this->assertNotNull($reservationId);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $reservationId,
+            'status' => $status,
+        ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'stock_reservation_id' => $reservationId,
+            'inventory_id' => $inventoryId,
+            'quantity' => $quantity,
+        ]);
+    }
+
    protected function createTenant(string $codigo, string $nombre, string $dominio): Tenant
    {
        $hdrKey = (string) Str::uuid();
--- a/tests/Feature/Sale/AdminAppSaleControllerTest.php
+++ b/tests/Feature/Sale/AdminAppSaleControllerTest.php
@@ -520,8 +520,10 @@ class AdminAppSaleControllerTest extends TestCase
            ->assertJsonPath('data.status', Purchase::STATUS_CANCELLED);

        $this->assertSoftDeleted('carritos', ['id' => $sourceCartId]);
+        $reservationId = $purchase->fresh()->stock_reservation_id;
+        $this->assertNotNull($reservationId);
        $this->assertDatabaseHas('stock_reservations', [
-            'purchase_id' => $purchase->id,
+            'id' => $reservationId,
            'status' => 'released',
        ]);
    }
--- a/tests/Feature/Seeders/DesfilePuraTendenciaSeederTest.php
+++ b/tests/Feature/Seeders/DesfilePuraTendenciaSeederTest.php
@@ -218,13 +218,13 @@ class DesfilePuraTendenciaSeederTest extends TestCase
            ->whereIn('variant_id', (clone $variants)->pluck('id'))
            ->count());
        $this->assertSame(330, (clone $variants)->whereNull('event_date_id')->count());
-        $this->assertSame(283, DB::table('inventories')
+        $this->assertSame(284, DB::table('inventories')
            ->whereIn('id', (clone $variants)->pluck('inventory_id'))
            ->where('real_stock', 1)
            ->where('reserved_stock', 0)
            ->where('sold_units', 0)
            ->count());
-        $this->assertSame(47, DB::table('inventories')
+        $this->assertSame(46, DB::table('inventories')
            ->whereIn('id', (clone $variants)->pluck('inventory_id'))
            ->where('real_stock', 0)
            ->where('reserved_stock', 0)
@@ -289,33 +289,30 @@ class DesfilePuraTendenciaSeederTest extends TestCase

        $items = DB::table('compra_items')->where('compra_id', $purchase->id);

-        $this->assertSame(49, (clone $items)->count());
-        $this->assertSame(49, (clone $items)
+        $this->assertSame(48, (clone $items)->count());
+        $this->assertSame(48, (clone $items)
            ->where('precio_unitario', 0)
            ->where('discount_total', 0)
            ->where('tax_total', 0)
            ->where('total', 0)
            ->count());
-        $this->assertSame(49, DB::table('tickets')
+        $this->assertSame(48, DB::table('tickets')
            ->where('source_purchase_id', $purchase->id)
            ->where('user_id', $user->id)
            ->where('source_catalog_item_id', $catalogItemId)
            ->count());
-        $this->assertSame(48, DB::table('stock_reservations')
-            ->where('purchase_id', $purchase->id)
+        $this->assertSame(1, DB::table('stock_reservations')
+            ->where('id', $purchase->stock_reservation_id)
            ->where('status', 'committed')
            ->count());
+        $this->assertSame(48, DB::table('stock_reservation_lines')
+            ->where('stock_reservation_id', $purchase->stock_reservation_id)
+            ->count());

        foreach ([
            ['sector' => 'A', 'fila' => '1', 'tipo' => 'NORMAL', 'count' => 16],
            ['sector' => 'A', 'fila' => '3', 'tipo' => 'NORMAL', 'count' => 14],
-            [
-                'sector' => 'C',
-                'fila' => '1',
-                'tipo' => 'VIP + LUNCH',
-                'count' => 17,
-                'seats' => array_map('strval', range(1, 17)),
-            ],
+            ['sector' => 'C', 'fila' => '1', 'tipo' => 'VIP + LUNCH', 'count' => 16],
            ['sector' => 'C', 'fila' => '3', 'tipo' => 'NORMAL', 'count' => 2, 'seats' => ['6', '7']],
        ] as $allocation) {
            $allocatedVariants = DB::table('variantes')
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -2,9 +2,25 @@

 namespace Tests;

+use Illuminate\Foundation\Application;
 use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
+use RuntimeException;

 abstract class TestCase extends BaseTestCase
 {
-    //
+    public function createApplication(): Application
+    {
+        $app = parent::createApplication();
+        $connection = (string) $app['config']->get('database.default');
+        $database = (string) $app['config']->get("database.connections.{$connection}.database");
+        $usesInMemorySqlite = $connection === 'sqlite' && $database === ':memory:';
+
+        if (! $usesInMemorySqlite && ! str_ends_with(strtolower($database), '_test')) {
+            throw new RuntimeException(
+                "Unsafe test database [{$database}]. Tests may only use an in-memory SQLite database or a database ending in _test.",
+            );
+        }
+
+        return $app;
+    }
 }
--- a/tests/Unit/Catalog/ExpireStockReservationsServiceTest.php
+++ b/tests/Unit/Catalog/ExpireStockReservationsServiceTest.php
@@ -2,77 +2,102 @@

 namespace Tests\Unit\Catalog;

-use App\Domains\Cart\Services\ExpireCartReservationsService;
+use App\Domains\Catalog\Models\Inventory;
+use App\Domains\Catalog\Models\StockReservation;
+use App\Domains\Catalog\Models\StockReservationLine;
 use App\Domains\Catalog\Services\ExpireStockReservationsService;
-use App\Domains\Purchase\Services\CheckoutService;
-use Illuminate\Support\Facades\Log;
-use Psr\Log\LoggerInterface;
+use App\Domains\Catalog\Services\StockReservationService;
+use App\Domains\Purchase\Services\Checkout\ReleaseCheckoutService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
 use RuntimeException;
 use Tests\TestCase;

 class ExpireStockReservationsServiceTest extends TestCase
 {
-    public function test_it_expires_purchases_before_abandoned_cart_items(): void
+    use RefreshDatabase;
+
+    public function test_it_expires_an_orphan_reservation_and_releases_its_inventory(): void
    {
-        $checkout = \Mockery::mock(CheckoutService::class);
-        $checkout->shouldReceive('expireOverduePurchases')
-            ->once()
-            ->ordered()
-            ->andReturn(2);
+        $inventory = Inventory::query()->create([
+            'real_stock' => 10,
+            'reserved_stock' => 2,
+        ]);
+        $reservation = StockReservation::query()->create([
+            'status' => StockReservation::STATUS_ACTIVE,
+            'expires_at' => now()->subMinute(),
+        ]);
+        StockReservationLine::query()->create([
+            'stock_reservation_id' => $reservation->id,
+            'inventory_id' => $inventory->id,
+            'quantity' => 2,
+            'tracks_inventory' => true,
+        ]);

-        $carts = \Mockery::mock(ExpireCartReservationsService::class);
-        $carts->shouldReceive('expireOverdue')
-            ->once()
-            ->ordered()
-            ->andReturn(3);
-
-        $logger = \Mockery::mock(LoggerInterface::class);
-        Log::shouldReceive('channel')
-            ->once()
-            ->with('commands')
-            ->andReturn($logger);
-        $logger->shouldReceive('info')
-            ->once()
-            ->with('Stock reservation cleanup completed.', [
-                'command' => 'reservations:expire',
-                'expired_purchases' => 2,
-                'expired_cart_items' => 3,
-                'total_expired' => 5,
-            ]);
-
-        $result = (new ExpireStockReservationsService($checkout, $carts))->expireOverdue();
+        $result = app(ExpireStockReservationsService::class)->expireOverdue();

        $this->assertSame([
-            'purchases' => 2,
-            'cart_items' => 3,
+            'purchases' => 0,
+            'cart_reservations' => 0,
+            'orphan_reservations' => 1,
+            'failed' => 0,
        ], $result);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $reservation->id,
+            'status' => StockReservation::STATUS_EXPIRED,
+            'expires_at' => null,
+        ]);
+        $this->assertDatabaseHas('inventories', [
+            'id' => $inventory->id,
+            'reserved_stock' => 0,
+        ]);
    }

-    public function test_it_logs_failed_cleanup_attempts_and_rethrows_the_error(): void
+    public function test_one_failed_reservation_does_not_stop_the_remaining_batch(): void
    {
-        $exception = new RuntimeException('Unable to clean carts.');
-        $checkout = \Mockery::mock(CheckoutService::class);
-        $checkout->shouldReceive('expireOverduePurchases')->once()->andReturn(2);
+        $first = StockReservation::query()->create([
+            'status' => StockReservation::STATUS_ACTIVE,
+            'expires_at' => now()->subMinutes(2),
+        ]);
+        $second = StockReservation::query()->create([
+            'status' => StockReservation::STATUS_ACTIVE,
+            'expires_at' => now()->subMinute(),
+        ]);

-        $carts = \Mockery::mock(ExpireCartReservationsService::class);
-        $carts->shouldReceive('expireOverdue')->once()->andThrow($exception);
+        $reservations = \Mockery::mock(StockReservationService::class);
+        $reservations->shouldReceive('expire')
+            ->twice()
+            ->andReturnUsing(function (StockReservation $reservation) use ($first): void {
+                if ($reservation->is($first)) {
+                    throw new RuntimeException('Broken reservation.');
+                }

-        $logger = \Mockery::mock(LoggerInterface::class);
-        Log::shouldReceive('channel')
-            ->once()
-            ->with('commands')
-            ->andReturn($logger);
-        $logger->shouldReceive('error')
-            ->once()
-            ->with('Stock reservation cleanup failed.', [
-                'command' => 'reservations:expire',
-                'expired_purchases' => 2,
-                'expired_cart_items' => null,
-                'exception' => $exception,
-            ]);
+                $reservation->update([
+                    'status' => StockReservation::STATUS_EXPIRED,
+                    'expires_at' => null,
+                    'expired_at' => now(),
+                ]);
+            });

-        $this->expectExceptionObject($exception);
+        $service = new ExpireStockReservationsService(
+            \Mockery::mock(ReleaseCheckoutService::class),
+            $reservations,
+        );

-        (new ExpireStockReservationsService($checkout, $carts))->expireOverdue();
+        $result = $service->expireOverdue();
+
+        $this->assertSame([
+            'purchases' => 0,
+            'cart_reservations' => 0,
+            'orphan_reservations' => 1,
+            'failed' => 1,
+        ], $result);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $first->id,
+            'status' => StockReservation::STATUS_ACTIVE,
+        ]);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $second->id,
+            'status' => StockReservation::STATUS_EXPIRED,
+        ]);
    }
 }
--- a/tests/Unit/Purchase/DniDistanceServiceTest.php
+++ b/tests/Unit/Purchase/DniDistanceServiceTest.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Tests\Unit\Purchase;
+
+use App\Domains\Purchase\Services\DniDistanceService;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+
+class DniDistanceServiceTest extends TestCase
+{
+    /** @return iterable<string, array{string, string, int}> */
+    public static function distances(): iterable
+    {
+        yield 'exact' => ['40123456', '40123456', 0];
+        yield 'leading transposition' => ['40123456', '04123456', 1];
+        yield 'trailing transposition' => ['40123456', '40123465', 1];
+        yield 'single substitution' => ['40123456', '40123856', 1];
+        yield 'substitution and transposition' => ['12345678', '12345087', 2];
+        yield 'seven digits normalized with leading zero' => ['04123456', '4123456', 0];
+        yield 'more than two edits' => ['40123456', '87654321', 7];
+    }
+
+    #[DataProvider('distances')]
+    public function test_it_calculates_damerau_levenshtein_distance(
+        string $left,
+        string $right,
+        int $expected,
+    ): void {
+        $this->assertSame($expected, (new DniDistanceService)->distance($left, $right));
+    }
+}
--- a/tests/Unit/Purchase/PurchaseResourceTest.php
+++ b/tests/Unit/Purchase/PurchaseResourceTest.php
@@ -0,0 +1,69 @@
+<?php
+
+namespace Tests\Unit\Purchase;
+
+use App\Domains\Catalog\Models\StockReservation;
+use App\Domains\Purchase\Models\Purchase;
+use App\Domains\Purchase\Resources\PurchaseResource;
+use Illuminate\Http\Request;
+use Illuminate\Support\Carbon;
+use Tests\TestCase;
+
+class PurchaseResourceTest extends TestCase
+{
+    public function test_it_exposes_the_remaining_checkout_time_using_the_server_clock(): void
+    {
+        $now = now()->startOfSecond();
+        $this->travelTo($now);
+        $expiresAt = $now->copy()->addMinutes(12);
+
+        $resource = $this->resourceFor(Purchase::STATUS_PENDING_PAYMENT, $expiresAt);
+
+        $this->assertTrue($expiresAt->equalTo($resource['expires_at']));
+        $this->assertSame(720, $resource['expires_in_seconds']);
+        $this->assertTrue($now->equalTo($resource['server_time']));
+
+        $this->travelBack();
+    }
+
+    public function test_it_clamps_an_overdue_checkout_to_zero_seconds(): void
+    {
+        $now = now()->startOfSecond();
+        $this->travelTo($now);
+
+        $resource = $this->resourceFor(
+            Purchase::STATUS_CREATED,
+            $now->copy()->subSecond(),
+        );
+
+        $this->assertSame(0, $resource['expires_in_seconds']);
+
+        $this->travelBack();
+    }
+
+    public function test_it_exposes_null_expiration_after_the_purchase_enters_review(): void
+    {
+        $resource = $this->resourceFor(
+            Purchase::STATUS_IN_REVIEW,
+            null,
+        );
+
+        $this->assertNull($resource['expires_at']);
+        $this->assertNull($resource['expires_in_seconds']);
+    }
+
+    /** @return array<string, mixed> */
+    private function resourceFor(string $status, ?Carbon $expiresAt): array
+    {
+        $purchase = (new Purchase)->forceFill([
+            'status' => $status,
+            'total' => '0.00',
+        ]);
+        $purchase->setRelation('stockReservation', (new StockReservation)->forceFill([
+            'status' => StockReservation::STATUS_ACTIVE,
+            'expires_at' => $expiresAt,
+        ]));
+
+        return (new PurchaseResource($purchase))->toArray(Request::create('/'));
+    }
+}
--- a/tests/Unit/Purchase/PurchaseStateGuardTest.php
+++ b/tests/Unit/Purchase/PurchaseStateGuardTest.php
@@ -2,6 +2,7 @@

 namespace Tests\Unit\Purchase;

+use App\Domains\Catalog\Models\StockReservation;
 use App\Domains\Purchase\Exceptions\PurchaseExpiredException;
 use App\Domains\Purchase\Models\Purchase;
 use App\Domains\Purchase\Services\PurchaseStateGuard;
@@ -22,7 +23,6 @@ class PurchaseStateGuardTest extends TestCase
    {
        $purchase = (new Purchase)->forceFill([
            'status' => Purchase::STATUS_EXPIRED,
-            'expires_at' => null,
        ]);

        $this->expectException(PurchaseExpiredException::class);
@@ -34,8 +34,11 @@ class PurchaseStateGuardTest extends TestCase
    {
        $purchase = (new Purchase)->forceFill([
            'status' => Purchase::STATUS_PENDING_PAYMENT,
-            'expires_at' => now()->subMinute(),
        ]);
+        $purchase->setRelation('stockReservation', (new StockReservation)->forceFill([
+            'status' => StockReservation::STATUS_ACTIVE,
+            'expires_at' => now()->subMinute(),
+        ]));

        $this->expectException(PurchaseExpiredException::class);

@@ -46,8 +49,11 @@ class PurchaseStateGuardTest extends TestCase
    {
        $purchase = (new Purchase)->forceFill([
            'status' => Purchase::STATUS_PAID,
-            'expires_at' => now()->subMinute(),
        ]);
+        $purchase->setRelation('stockReservation', (new StockReservation)->forceFill([
+            'status' => StockReservation::STATUS_ACTIVE,
+            'expires_at' => now()->subMinute(),
+        ]));

        $this->guard->assertNotExpired($purchase);