Squashed commit of the following:

commit 1dc4e29c69
Author: ncoronel <ncoronel@quo.ar>
Date:   Wed Aug 19 13:58:03 2026 -0300

    refactor(reservations): unify expiration command

commit 093e894cc3
Author: ncoronel <ncoronel@quo.ar>
Date:   Wed Aug 19 13:48:09 2026 -0300

    feat(cart): expire abandoned stock reservations

commit fdf0f3328f
Author: ncoronel <ncoronel@quo.ar>
Date:   Wed Aug 19 12:53:12 2026 -0300

    refactor(stock): implement expiration for stock reservations and add configuration

commit 8d6bcdcc43
Author: ncoronel <ncoronel@quo.ar>
Date:   Wed Aug 19 12:38:21 2026 -0300

    refactor(cart): invalidate payment on actual changes

commit 3206e293eb
Author: ncoronel <ncoronel@quo.ar>
Date:   Wed Aug 19 12:24:48 2026 -0300

    refactor(cart): own checkout item editing

commit aed99bd05e
Author: ncoronel <ncoronel@quo.ar>
Date:   Wed Aug 19 12:14:57 2026 -0300

    refactor(checkout): remove legacy purchase item reservations

commit f1649e0e4b
Author: ncoronel <ncoronel@quo.ar>
Date:   Wed Aug 19 12:06:29 2026 -0300

    refactor(checkout): materialize purchase items on confirmation

commit e6c4b40a37
Author: ncoronel <ncoronel@quo.ar>
Date:   Wed Aug 19 12:06:19 2026 -0300

    feat(inventory): add traceable cart stock reservations

app/Domains/Cart/Controllers/CartController.php

@@ -2,6 +2,7 @@
 
 namespace App\Domains\Cart\Controllers;
 
+use App\Domains\Cart\Models\Cart;
 use App\Domains\Cart\Models\CartItem;
 use App\Domains\Cart\Requests\AddCartItemRequest;
 use App\Domains\Cart\Requests\UpdateCartItemQuantityRequest;
@@ -77,6 +78,36 @@ class CartController extends Controller
         ]);
     }
 
+    public function updateCheckoutItem(
+        UpdateCartItemQuantityRequest $request,
+        Tenant $tenant,
+        Cart $cart,
+        CartItem $cartItem,
+    ): CartResource {
+        $updatesVariant = $request->exists('variant_id');
+
+        return CartResource::make(
+            $this->cartService->updateCheckoutItem(
+                $tenant,
+                $request,
+                $cart,
+                $cartItem->getKey(),
+                (int) $request->validated('cantidad'),
+                $updatesVariant
+                    ? ($request->validated('variant_id') !== null
+                        ? (int) $request->validated('variant_id')
+                        : null)
+                    : $cartItem->variant_id,
+                $updatesVariant,
+            ),
+        )->additional([
+            'code' => $updatesVariant ? 'cart.item_updated' : 'cart.quantity_updated',
+            'message' => $updatesVariant
+                ? __('api.cart.item_updated')
+                : __('api.cart.quantity_updated'),
+        ]);
+    }
+
     public function removeItem(Request $request, Tenant $tenant, CartItem $cartItem): CartResource
     {
         return CartResource::make(

app/Domains/Cart/Models/Cart.php

@@ -7,6 +7,8 @@ use App\Domains\Catalog\Models\CatalogItem;
 use App\Domains\Catalog\Models\Inventory;
 use App\Domains\Catalog\Models\Variant;
 use App\Domains\Catalog\Services\CatalogInventoryService;
+use App\Domains\Catalog\Services\StockReservationService;
+use App\Domains\Purchase\Models\Purchase;
 use App\Domains\Purchase\Services\UserPurchaseLimitService;
 use App\Domains\Tenant\Models\Tenant;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
@@ -24,6 +26,7 @@ use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
     'user_id',
     'guest_token',
     'status',
+    'origin',
 ])]
 class Cart extends Model
 {
@@ -32,6 +35,10 @@ class Cart extends Model
 
     protected $table = 'carritos';
 
+    public const ORIGIN_USER = 'user';
+
+    public const ORIGIN_DIRECT_CHECKOUT = 'direct_checkout';
+
     protected function casts(): array
     {
         return [
@@ -63,6 +70,12 @@ class Cart extends Model
         return $this->hasMany(CartItem::class, 'cart_id');
     }
 
+    /** @return HasMany<Purchase, $this> */
+    public function purchases(): HasMany
+    {
+        return $this->hasMany(Purchase::class, 'cart_id');
+    }
+
     public function getTotalAmount(): float
     {
         $items = $this->relationLoaded('items')
@@ -114,11 +127,12 @@ class Cart extends Model
                     'cantidad' => $quantity,
                 ]);
             } else {
+                app(StockReservationService::class)->ensure($item, $selectedItem);
                 $item->cantidad += $quantity;
                 $item->save();
             }
 
-            $inventoryService->reserve($selectedItem, $quantity);
+            app(StockReservationService::class)->reserve($item, $selectedItem, $quantity);
 
             return $item->fresh();
         });
@@ -129,6 +143,7 @@ class Cart extends Model
         int $quantity,
         ?int $variantId = null,
         bool $updateVariant = false,
+        ?int $excludedPurchaseId = null,
     ): CartItem {
         if ($quantity <= 0) {
             throw ValidationException::withMessages([
@@ -141,6 +156,7 @@ class Cart extends Model
             $quantity,
             $variantId,
             $updateVariant,
+            $excludedPurchaseId,
         ): CartItem {
             /** @var CartItem $item */
             $item = $this->items()
@@ -168,9 +184,10 @@ class Cart extends Model
                 $this->assertUserPurchaseLimit(
                     $nextSelection,
                     $otherVariantsQuantity + $quantity,
+                    $excludedPurchaseId,
                 );
 
-                $inventoryService->release($currentSelection, $item->cantidad);
+                app(StockReservationService::class)->release($item, $currentSelection, $item->cantidad);
                 $availableQuantity = $inventoryService->availableQuantity($nextSelection);
 
                 if ($availableQuantity !== null && $availableQuantity < $quantity) {
@@ -186,11 +203,11 @@ class Cart extends Model
                     ->lockForUpdate()
                     ->first();
 
-                $inventoryService->reserve($nextSelection, $quantity);
-
                 if ($targetItem !== null) {
+                    app(StockReservationService::class)->ensure($targetItem, $nextSelection);
                     $targetItem->cantidad += $quantity;
                     $targetItem->save();
+                    app(StockReservationService::class)->reserve($targetItem, $nextSelection, $quantity);
                     $item->delete();
 
                     return $targetItem->fresh();
@@ -199,6 +216,7 @@ class Cart extends Model
                 $item->variant_id = $variantId;
                 $item->cantidad = $quantity;
                 $item->save();
+                app(StockReservationService::class)->reserve($item, $nextSelection, $quantity);
 
                 return $item->fresh();
             }
@@ -213,6 +231,7 @@ class Cart extends Model
                 $this->assertUserPurchaseLimit(
                     $currentSelection,
                     $otherVariantsQuantity + $quantity,
+                    $excludedPurchaseId,
                 );
             }
 
@@ -225,17 +244,17 @@ class Cart extends Model
                 ]);
             }
 
-            $item->cantidad = $quantity;
-            $item->save();
-
             if ($delta > 0) {
-                $inventoryService->reserve($currentSelection, $delta);
+                app(StockReservationService::class)->reserve($item, $currentSelection, $delta);
             }
 
             if ($delta < 0) {
-                $inventoryService->release($currentSelection, abs($delta));
+                app(StockReservationService::class)->release($item, $currentSelection, abs($delta));
             }
 
+            $item->cantidad = $quantity;
+            $item->save();
+
             return $item->fresh();
         });
     }
@@ -254,7 +273,8 @@ class Cart extends Model
                 $item->variant_id,
                 true,
             );
-            app(CatalogInventoryService::class)->release(
+            app(StockReservationService::class)->release(
+                $item,
                 $selectedItem,
                 $item->cantidad,
             );
@@ -334,6 +354,7 @@ class Cart extends Model
     private function assertUserPurchaseLimit(
         CatalogItem|Variant $selectedItem,
         int $cartQuantity,
+        ?int $excludedPurchaseId = null,
     ): void {
         if ($this->user_id === null) {
             return;
@@ -347,6 +368,7 @@ class Cart extends Model
             $catalogItem,
             $this->user_id,
             $cartQuantity,
+            $excludedPurchaseId,
             field: 'cantidad',
         );
     }

app/Domains/Cart/Models/CartItem.php

@@ -3,11 +3,13 @@
 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',
@@ -55,4 +57,10 @@ class CartItem extends Model
     {
         return $this->variant ?? $this->catalogItem;
     }
+
+    /** @return HasMany<StockReservation, $this> */
+    public function stockReservations(): HasMany
+    {
+        return $this->hasMany(StockReservation::class);
+    }
 }

app/Domains/Cart/Services/CartService.php

@@ -4,15 +4,24 @@ namespace App\Domains\Cart\Services;
 
 use App\Domains\Auth\Models\User;
 use App\Domains\Cart\Models\Cart;
+use App\Domains\Cart\Models\CartItem;
+use App\Domains\Catalog\Services\StockReservationService;
+use App\Domains\Purchase\Models\Purchase;
 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;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 
 class CartService
 {
+    public function __construct(
+        private readonly StockReservationService $reservations,
+    ) {}
+
     public function show(Tenant $tenant, Request $request): Cart
     {
         $resolvedIdentity = $this->resolveIdentity($request);
@@ -66,6 +75,107 @@ class CartService
         return $this->loadCart($cart);
     }
 
+    public function updateCheckoutItem(
+        Tenant $tenant,
+        Request $request,
+        Cart $cart,
+        int $cartItemId,
+        int $quantity,
+        ?int $variantId,
+        bool $updateVariant,
+    ): Cart {
+        $user = $request->user() ?? Auth::guard('sanctum')->user();
+
+        if (! $user instanceof User) {
+            throw new NotFoundHttpException('Checkout cart not found.');
+        }
+
+        return DB::transaction(function () use (
+            $tenant,
+            $user,
+            $cart,
+            $cartItemId,
+            $quantity,
+            $variantId,
+            $updateVariant,
+        ): Cart {
+            /** @var Purchase|null $purchase */
+            $purchase = Purchase::query()
+                ->where('cart_id', $cart->getKey())
+                ->where('tenant_codigo', $tenant->codigo)
+                ->where('user_id', $user->getKey())
+                ->whereIn('status', [
+                    Purchase::STATUS_CREATED,
+                    Purchase::STATUS_PENDING_PAYMENT,
+                ])
+                ->whereDoesntHave('items')
+                ->lockForUpdate()
+                ->first();
+
+            if ($purchase === null) {
+                throw new NotFoundHttpException('Checkout cart not found.');
+            }
+
+            if ($purchase->expires_at !== null && $purchase->expires_at->isPast()) {
+                throw ValidationException::withMessages([
+                    'cart' => __('api.purchase.not_editable'),
+                ]);
+            }
+
+            /** @var Cart|null $checkoutCart */
+            $checkoutCart = Cart::query()
+                ->whereKey($cart->getKey())
+                ->where('tenant_codigo', $tenant->codigo)
+                ->where('user_id', $user->getKey())
+                ->where('status', 'checkout')
+                ->lockForUpdate()
+                ->first();
+
+            if ($checkoutCart === null) {
+                throw new NotFoundHttpException('Checkout cart not found.');
+            }
+
+            /** @var CartItem|null $cartItem */
+            $cartItem = $checkoutCart->items()
+                ->whereKey($cartItemId)
+                ->lockForUpdate()
+                ->first();
+
+            if ($cartItem === null) {
+                throw new NotFoundHttpException('Checkout item not found.');
+            }
+
+            $hasChanges = (int) $cartItem->cantidad !== $quantity
+                || ($updateVariant && $cartItem->variant_id !== $variantId);
+
+            if (! $hasChanges) {
+                return $this->loadCart($checkoutCart);
+            }
+
+            $checkoutCart->updateItem(
+                $cartItemId,
+                $quantity,
+                $variantId,
+                $updateVariant,
+                $purchase->getKey(),
+            );
+
+            $purchase->telepagosQr()->delete();
+            $purchase->update([
+                'status' => Purchase::STATUS_CREATED,
+                'payment_method' => null,
+                'transfer_payer_dni' => null,
+                'total' => $checkoutCart->getTotalAmount(),
+                'expires_at' => now()->addMinutes(
+                    max(1, (int) config('purchase.checkout_expiration_minutes', 30)),
+                ),
+            ]);
+            $this->reservations->syncPurchaseExpiration($purchase);
+
+            return $this->loadCart($checkoutCart);
+        });
+    }
+
     public function removeItem(Tenant $tenant, Request $request, int $cartItemId): Cart
     {
         $identity = $this->requireIdentity($request);

app/Domains/Cart/Services/ExpireCartReservationsService.php

@@ -0,0 +1,123 @@
+<?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;
+        });
+    }
+}

app/Domains/Cart/Services/GuestCartMergeService.php

@@ -34,6 +34,10 @@ class GuestCartMergeService
                 ->first();
 
             if ($userCart !== null) {
+                $userCart->items()
+                    ->orderBy('id')
+                    ->pluck('id')
+                    ->each(fn (int $itemId) => $userCart->removeItem($itemId));
                 $userCart->update([
                     'status' => 'converted',
                 ]);

app/Domains/Cart/documentacion/README.md

@@ -7,11 +7,12 @@ 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.
-- `CartItem`: referencia un `CatalogItem` y, opcionalmente, una `Variant`; expone la selección efectiva.
+- `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
@@ -30,3 +31,7 @@ Bajo `/tenants/{tenant:codigo}`:
 ## Dependencias y reglas
 
 Depende de `Catalog` para productos y variantes, de `Tenant` para aislar datos y de `Auth` cuando existe usuario. Toda operación debe comprobar que carrito e ítem pertenecen al tenant actual.
+
+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.

app/Domains/Cart/routes/api.php

@@ -10,3 +10,9 @@ Route::prefix('tenants/{tenant:codigo}')
         Route::patch('cart/items/{cartItem}', [CartController::class, 'updateItemQuantity']);
         Route::delete('cart/items/{cartItem}', [CartController::class, 'removeItem']);
     });
+
+Route::prefix('tenants/{tenant:codigo}')
+    ->middleware('auth:sanctum')
+    ->group(function (): void {
+        Route::patch('checkout-carts/{cart}/items/{cartItem}', [CartController::class, 'updateCheckoutItem']);
+    });

app/Domains/Catalog/Models/Inventory.php

@@ -5,6 +5,7 @@ namespace App\Domains\Catalog\Models;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\Relations\HasOne;
 
 #[Fillable([
@@ -47,6 +48,12 @@ class Inventory extends Model
         return $this->hasOne(Variant::class);
     }
 
+    /** @return HasMany<StockReservation, $this> */
+    public function stockReservations(): HasMany
+    {
+        return $this->hasMany(StockReservation::class);
+    }
+
     public function availableStock(): int
     {
         return max(0, $this->real_stock - $this->reserved_stock);

app/Domains/Catalog/Models/StockReservation.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace App\Domains\Catalog\Models;
+
+use App\Domains\Cart\Models\CartItem;
+use App\Domains\Purchase\Models\Purchase;
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+#[Fillable([
+    'inventory_id',
+    'cart_item_id',
+    'purchase_id',
+    'quantity',
+    'status',
+    'expires_at',
+    'committed_at',
+    'released_at',
+])]
+class StockReservation extends Model
+{
+    public const STATUS_ACTIVE = 'active';
+
+    public const STATUS_COMMITTED = 'committed';
+
+    public const STATUS_RELEASED = 'released';
+
+    public const STATUS_EXPIRED = 'expired';
+
+    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',
+        ];
+    }
+
+    /** @return BelongsTo<Inventory, $this> */
+    public function inventory(): BelongsTo
+    {
+        return $this->belongsTo(Inventory::class);
+    }
+
+    /** @return BelongsTo<CartItem, $this> */
+    public function cartItem(): BelongsTo
+    {
+        return $this->belongsTo(CartItem::class);
+    }
+
+    /** @return BelongsTo<Purchase, $this> */
+    public function purchase(): BelongsTo
+    {
+        return $this->belongsTo(Purchase::class);
+    }
+}

app/Domains/Catalog/Services/CatalogInventoryService.php

@@ -12,6 +12,19 @@ use Illuminate\Support\Facades\DB;
 
 class CatalogInventoryService
 {
+    /** @return array<int, int> */
+    public function requirementsFor(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): int => $requirement['quantity'] * $quantity,
+            $this->inventoryRequirements($selection),
+        );
+    }
+
     public function availableQuantity(CatalogItem|Variant $selection): ?int
     {
         if ($selection instanceof CatalogItem

app/Domains/Catalog/Services/ExpireStockReservationsService.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Domains\Catalog\Services;
+
+use App\Domains\Cart\Services\ExpireCartReservationsService;
+use App\Domains\Purchase\Services\CheckoutService;
+
+class ExpireStockReservationsService
+{
+    public function __construct(
+        private readonly CheckoutService $checkout,
+        private readonly ExpireCartReservationsService $carts,
+    ) {}
+
+    /**
+     * @return array{purchases: int, cart_items: int}
+     */
+    public function expireOverdue(): array
+    {
+        return [
+            'purchases' => $this->checkout->expireOverduePurchases(),
+            'cart_items' => $this->carts->expireOverdue(),
+        ];
+    }
+}

app/Domains/Catalog/Services/StockReservationService.php

@@ -0,0 +1,230 @@
+<?php
+
+namespace App\Domains\Catalog\Services;
+
+use App\Domains\Cart\Models\CartItem;
+use App\Domains\Catalog\Models\CatalogItem;
+use App\Domains\Catalog\Models\StockReservation;
+use App\Domains\Catalog\Models\Variant;
+use App\Domains\Purchase\Models\Purchase;
+use Illuminate\Support\Carbon;
+use Illuminate\Support\Facades\DB;
+
+class StockReservationService
+{
+    public function __construct(
+        private readonly CatalogInventoryService $inventory,
+    ) {}
+
+    public function reserve(CartItem $cartItem, CatalogItem|Variant $selection, int $quantity): void
+    {
+        DB::transaction(function () use ($cartItem, $selection, $quantity): void {
+            $this->inventory->reserve($selection, $quantity);
+            $this->recordIncrease($cartItem, $selection, $quantity);
+        });
+    }
+
+    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);
+        });
+    }
+
+    public function commit(CartItem $cartItem, CatalogItem|Variant $selection): void
+    {
+        DB::transaction(function () use ($cartItem, $selection): void {
+            $this->ensure($cartItem, $selection);
+            $this->inventory->commit($selection, (int) $cartItem->cantidad);
+
+            $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->quantity !== $quantity) {
+                    throw new \InvalidArgumentException('La reserva de stock no coincide con el item del carrito.');
+                }
+
+                $reservation->update([
+                    'status' => StockReservation::STATUS_COMMITTED,
+                    'committed_at' => now(),
+                    'expires_at' => 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,
+                    'status' => StockReservation::STATUS_ACTIVE,
+                    'expires_at' => $this->expiration(),
+                ]);
+
+                continue;
+            }
+
+            if ($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(),
+                ]);
+            }
+        }
+    }
+
+    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 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', $source->getKey())
+                ->where('status', StockReservation::STATUS_ACTIVE)
+                ->orderBy('inventory_id')
+                ->lockForUpdate()
+                ->get();
+
+            foreach ($sourceReservations as $sourceReservation) {
+                $targetReservation = $this->lockReservation($target, (int) $sourceReservation->inventory_id);
+
+                if ($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(),
+                    ]);
+
+                    continue;
+                }
+
+                $targetReservation->update([
+                    'quantity' => $targetReservation->quantity + $sourceReservation->quantity,
+                    'status' => StockReservation::STATUS_ACTIVE,
+                    'expires_at' => $this->expiration(),
+                ]);
+                $sourceReservation->delete();
+            }
+        });
+    }
+
+    private function recordIncrease(CartItem $cartItem, CatalogItem|Variant $selection, int $quantity): void
+    {
+        foreach ($this->inventory->requirementsFor($selection, $quantity) as $inventoryId => $requiredQuantity) {
+            $reservation = $this->lockReservation($cartItem, $inventoryId);
+
+            if ($reservation === null) {
+                StockReservation::query()->create([
+                    'inventory_id' => $inventoryId,
+                    'cart_item_id' => $cartItem->getKey(),
+                    'quantity' => $requiredQuantity,
+                    'status' => StockReservation::STATUS_ACTIVE,
+                    'expires_at' => $this->expiration(),
+                ]);
+
+                continue;
+            }
+
+            $reservation->update([
+                'quantity' => ($reservation->status === StockReservation::STATUS_ACTIVE ? $reservation->quantity : 0) + $requiredQuantity,
+                'status' => StockReservation::STATUS_ACTIVE,
+                'committed_at' => null,
+                'released_at' => null,
+                'expires_at' => $this->expiration(),
+            ]);
+        }
+    }
+
+    private function recordDecrease(
+        CartItem $cartItem,
+        CatalogItem|Variant $selection,
+        int $quantity,
+        string $releasedStatus,
+    ): void {
+        foreach ($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.');
+            }
+
+            $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,
+            ]);
+        }
+    }
+
+    private function lockReservation(CartItem $cartItem, int $inventoryId): ?StockReservation
+    {
+        return StockReservation::query()
+            ->where('cart_item_id', $cartItem->getKey())
+            ->where('inventory_id', $inventoryId)
+            ->lockForUpdate()
+            ->first();
+    }
+
+    private function expiration(): Carbon
+    {
+        return now()->addMinutes(
+            max(1, (int) config('catalog.stock_reservation_expiration_minutes', 30)),
+        );
+    }
+}

app/Domains/Catalog/documentacion/README.md

@@ -9,6 +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`.
 - `Category` soporta jerarquía y categorías globales o propias del tenant.
 - `FeaturedGroup` y `FeaturedItem` organizan secciones destacadas.
 - `BundleComponent` representa los componentes de un paquete.
@@ -17,6 +18,7 @@ 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`.
 - `FeaturedGroupService`: pagina los ítems destacados para la tienda.
 - `OnTicketFeaturedGroupService`: administra grupos destacados del panel para sitios de tickets.
 

app/Domains/Purchase/Controllers/PurchaseController.php

@@ -4,11 +4,9 @@ namespace App\Domains\Purchase\Controllers;
 
 use App\Domains\Integration\Services\TelepagosIntegrationService;
 use App\Domains\Purchase\Models\Purchase;
-use App\Domains\Purchase\Models\PurchaseItem;
 use App\Domains\Purchase\Requests\PaymentIntentRequest;
 use App\Domains\Purchase\Requests\StartCheckoutRequest;
 use App\Domains\Purchase\Requests\UpdatePurchaseCustomerRequest;
-use App\Domains\Purchase\Requests\UpdatePurchaseItemQuantityRequest;
 use App\Domains\Purchase\Resources\PurchaseResource;
 use App\Domains\Purchase\Services\CheckoutService;
 use App\Domains\Tenant\Models\Tenant;
@@ -56,7 +54,16 @@ class PurchaseController extends Controller
     {
         $compra = $this->resolveScopedPurchase($tenant, $request->user()->id, $compra);
 
-        $compra->loadMissing('items')->loadCount('tickets');
+        $compra->loadMissing([
+            'items',
+            'cart.items.catalogItem.inventory',
+            'cart.items.catalogItem.attachments',
+            'cart.items.variant.inventory',
+            'cart.items.variant.attachments',
+            'cart.items.variant.definitions.itemAttribute.attribute',
+            'cart.items.variant.eventDates',
+            'cart.items.variant.eventDate',
+        ])->loadCount('tickets');
         $compra->items->load('imageAttachment');
 
         return PurchaseResource::make($compra);
@@ -75,39 +82,12 @@ class PurchaseController extends Controller
         );
     }
 
-    public function updateItemQuantity(
-        UpdatePurchaseItemQuantityRequest $request,
-        Tenant $tenant,
-        Purchase $compra,
-        PurchaseItem $item,
-        CheckoutService $checkoutService,
-    ): PurchaseResource {
-        $compra = $this->resolveScopedPurchase($tenant, $request->user()->id, $compra);
-
-        return PurchaseResource::make(
-            $checkoutService->updateItemQuantity(
-                $compra,
-                $item,
-                (int) $request->validated('quantity'),
-            ),
-        );
-    }
-
-    public function prepareItemEditing(
-        Request $request,
+    public function paymentIntent(
+        PaymentIntentRequest $request,
         Tenant $tenant,
         Purchase $compra,
         CheckoutService $checkoutService,
-    ): PurchaseResource {
-        $compra = $this->resolveScopedPurchase($tenant, $request->user()->id, $compra);
-
-        return PurchaseResource::make(
-            $checkoutService->prepareItemEditing($compra),
-        );
-    }
-
-    public function paymentIntent(PaymentIntentRequest $request, Tenant $tenant, Purchase $compra): JsonResponse
-    {
+    ): JsonResponse {
         $compra = $this->resolveScopedPurchase($tenant, $request->user()->id, $compra);
         $method = $request->validated('method');
         $totalAmount = $compra->calculateCurrentTotalAmount();
@@ -148,13 +128,14 @@ class PurchaseController extends Controller
             return true;
         });
 
-        if ($updated === 0) {
+        if (! $updated) {
             throw ValidationException::withMessages([
                 'purchase' => __('api.purchase.not_available_for_payment'),
             ]);
         }
 
         $compra->refresh();
+        $checkoutService->syncReservationExpiration($compra);
 
         if ($method === 'transfer') {
             $telepagosService = new TelepagosIntegrationService;

app/Domains/Purchase/Models/Purchase.php

@@ -4,6 +4,7 @@ namespace App\Domains\Purchase\Models;
 
 use App\Domains\Auth\Models\User;
 use App\Domains\Cart\Models\Cart;
+use App\Domains\Catalog\Models\StockReservation;
 use App\Domains\Logging\Models\Concerns\LogsValueChanges;
 use App\Domains\Purchase\Events\PurchasePaid;
 use App\Domains\Tenant\Models\Tenant;
@@ -116,6 +117,12 @@ class Purchase extends Model
         return $this->hasMany(Ticket::class, 'source_purchase_id');
     }
 
+    /** @return HasMany<StockReservation, $this> */
+    public function stockReservations(): HasMany
+    {
+        return $this->hasMany(StockReservation::class);
+    }
+
     /**
      * @return HasOne<TelepagosQr, $this>
      */
@@ -143,11 +150,16 @@ class Purchase extends Model
 
     public function calculateCurrentTotalAmount(): float
     {
-        if ($this->relationLoaded('items')) {
+        if ($this->relationLoaded('items') && $this->getRelation('items')->isNotEmpty()) {
             return (float) $this->getRelation('items')->sum('total');
         }
 
-        return (float) $this->items()->sum('total');
+        $itemsTotal = (float) $this->items()->sum('total');
+        if ($itemsTotal > 0 || $this->items()->exists()) {
+            return $itemsTotal;
+        }
+
+        return (float) ($this->cart?->getTotalAmount() ?? $this->total ?? 0);
     }
 
     protected function valueChangeTenantCode(): string

app/Domains/Purchase/Models/PurchaseItem.php

@@ -23,18 +23,11 @@ use Illuminate\Database\Eloquent\Relations\BelongsTo;
     'discount_total',
     'tax_total',
     'total',
-    'reservation_status',
 ])]
 class PurchaseItem extends Model
 {
     use HasFactory;
 
-    public const RESERVATION_ACTIVE = 'active';
-
-    public const RESERVATION_COMMITTED = 'committed';
-
-    public const RESERVATION_RELEASED = 'released';
-
     protected $table = 'compra_items';
 
     protected function casts(): array

app/Domains/Purchase/Requests/UpdatePurchaseItemQuantityRequest.php

@@ -1,23 +0,0 @@
-<?php
-
-namespace App\Domains\Purchase\Requests;
-
-use Illuminate\Foundation\Http\FormRequest;
-
-class UpdatePurchaseItemQuantityRequest extends FormRequest
-{
-    public function authorize(): bool
-    {
-        return $this->user() !== null;
-    }
-
-    /**
-     * @return array<string, mixed>
-     */
-    public function rules(): array
-    {
-        return [
-            'quantity' => ['required', 'integer', 'min:1', 'max:100'],
-        ];
-    }
-}

app/Domains/Purchase/Resources/PurchaseItemResource.php

@@ -57,22 +57,12 @@ class PurchaseItemResource extends JsonResource
             'quantity' => $quantity,
             'unit_price' => $this->formatMoney($unitPrice),
             'line_total' => $this->formatMoney($lineTotal),
-            'catalog_item_id' => $this->catalog_item_id,
-            'variant_id' => $this->variant_id,
-            'product' => $catalogItem === null ? null : [
-                'id' => $catalogItem->id,
-                'nombre' => $catalogItem->nombre,
-                'descripcion' => $catalogItem->descripcion,
-                'slug' => $catalogItem->slug,
-                'imagen' => $imageUrl,
-            ],
-            'variant' => $variant === null ? null : [
-                'id' => $variant->id,
-                'attributes' => $this->resolveAttributes($variant),
-            ],
+            'source_catalog_item_id' => $this->catalog_item_id,
+            'source_variant_id' => $this->variant_id,
             'item_details' => $selectedItem === null ? null : [
                 'nombre' => $selectedItem->getName(),
                 'descripcion' => $selectedItem->getDescription(),
+                'slug' => $catalogItem?->slug,
                 'imagen' => $imageUrl,
                 'attributes' => $variant === null ? [] : $this->resolveAttributes($variant),
             ],

app/Domains/Purchase/Resources/PurchaseResource.php

@@ -2,6 +2,7 @@
 
 namespace App\Domains\Purchase\Resources;
 
+use App\Domains\Cart\Models\CartItem;
 use App\Domains\Purchase\Models\Purchase;
 use App\Domains\Purchase\Models\PurchaseItem;
 use Illuminate\Http\Request;
@@ -17,26 +18,37 @@ class PurchaseResource extends JsonResource
      */
     public function toArray(Request $request): array
     {
-        $items = $this->resource->relationLoaded('items')
+        $purchaseItems = $this->resource->relationLoaded('items')
             ? $this->resource->getRelation('items')
             : collect();
+        $cartItems = $purchaseItems->isEmpty()
+            && $this->resource->relationLoaded('cart')
+            && $this->resource->getRelation('cart')?->relationLoaded('items')
+                ? $this->resource->getRelation('cart')->getRelation('items')
+                : collect();
+        $items = $purchaseItems->isNotEmpty() ? $purchaseItems : $cartItems;
+        $itemsSource = $purchaseItems->isNotEmpty()
+            ? 'purchase'
+            : ($cartItems->isNotEmpty() ? 'cart' : null);
         $ticketsCount = array_key_exists('tickets_count', $this->resource->getAttributes())
             ? (int) $this->resource->getAttribute('tickets_count')
             : null;
 
         $subtotal = $items->isNotEmpty()
             ? $items->reduce(
-                fn (float $carry, PurchaseItem $item): float => $carry + $this->resolveItemSubtotal($item),
+                fn (float $carry, PurchaseItem|CartItem $item): float => $carry + $this->resolveItemSubtotal($item),
                 0.0,
             )
             : (float) ($this->total ?? 0);
 
-        $total = $items->isNotEmpty()
-            ? $items->reduce(
-                fn (float $carry, PurchaseItem $item): float => $carry + $this->resolveItemTotal($item),
-                0.0,
-            )
-            : (float) ($this->total ?? 0);
+        $total = $this->status === Purchase::STATUS_PAID && $this->total !== null
+            ? (float) $this->total
+            : ($items->isNotEmpty()
+                ? $items->reduce(
+                    fn (float $carry, PurchaseItem|CartItem $item): float => $carry + $this->resolveItemTotal($item),
+                    0.0,
+                )
+                : (float) ($this->total ?? 0));
 
         return [
             'id' => $this->id,
@@ -52,7 +64,7 @@ class PurchaseResource extends JsonResource
             'telefono' => $this->telefono,
             'nombre_apellido' => $this->nombre_apellido,
             'email' => $this->email,
-            'items_source' => $items->isNotEmpty() ? 'purchase' : null,
+            'items_source' => $itemsSource,
             'items' => PurchaseItemResource::collection($items),
             'tickets_count' => $this->when($ticketsCount !== null, $ticketsCount),
             'has_generated_tickets' => $this->when($ticketsCount !== null, $ticketsCount > 0),
@@ -61,13 +73,21 @@ class PurchaseResource extends JsonResource
         ];
     }
 
-    protected function resolveItemSubtotal(PurchaseItem $item): float
+    protected function resolveItemSubtotal(PurchaseItem|CartItem $item): float
     {
+        if ($item instanceof CartItem) {
+            return (float) ($item->selectedItem()?->getPrice() ?? 0) * $item->cantidad;
+        }
+
         return (float) $item->precio_unitario * $item->cantidad;
     }
 
-    protected function resolveItemTotal(PurchaseItem $item): float
+    protected function resolveItemTotal(PurchaseItem|CartItem $item): float
     {
+        if ($item instanceof CartItem) {
+            return $this->resolveItemSubtotal($item);
+        }
+
         return (float) ($item->total ?? 0);
     }
 

app/Domains/Purchase/Services/Checkout/CatalogSelectionResolver.php

@@ -5,7 +5,6 @@ namespace App\Domains\Purchase\Services\Checkout;
 use App\Domains\Catalog\Models\CatalogItem;
 use App\Domains\Catalog\Models\Inventory;
 use App\Domains\Catalog\Models\Variant;
-use App\Domains\Purchase\Models\PurchaseItem;
 use App\Domains\Tenant\Models\Tenant;
 use Illuminate\Validation\ValidationException;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
@@ -79,13 +78,4 @@ class CatalogSelectionResolver
 
         return $variant;
     }
-
-    public function resolvePurchaseItem(Tenant $tenant, PurchaseItem $item): CatalogItem|Variant
-    {
-        return $this->resolve(
-            $tenant,
-            (int) $item->source_catalog_item_id,
-            $item->source_variant_id === null ? null : (int) $item->source_variant_id,
-        );
-    }
 }

app/Domains/Purchase/Services/Checkout/CompleteCheckoutService.php

@@ -2,18 +2,19 @@
 
 namespace App\Domains\Purchase\Services\Checkout;
 
-use App\Domains\Catalog\Services\CatalogInventoryService;
+use App\Domains\Cart\Models\CartItem;
+use App\Domains\Catalog\Services\StockReservationService;
 use App\Domains\Purchase\Models\Purchase;
-use App\Domains\Purchase\Models\PurchaseItem;
+use Illuminate\Support\Collection;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Validation\ValidationException;
 
 class CompleteCheckoutService
 {
     public function __construct(
-        private readonly CatalogInventoryService $inventory,
-        private readonly CatalogSelectionResolver $selections,
+        private readonly StockReservationService $reservations,
         private readonly SourceCartService $sourceCart,
+        private readonly PurchaseItemSnapshotFactory $snapshots,
     ) {}
 
     public function complete(Purchase $purchase): Purchase
@@ -59,6 +60,7 @@ class CompleteCheckoutService
             }
 
             $purchase->update(['expires_at' => null]);
+            $this->reservations->syncPurchaseExpiration($purchase);
 
             return $this->loadPurchase($purchase);
         });
@@ -83,25 +85,51 @@ class CompleteCheckoutService
                 ]);
             }
 
-            $items = $purchase->items()
-                ->where('reservation_status', PurchaseItem::RESERVATION_ACTIVE)
-                ->lockForUpdate()
-                ->get();
+            if ($purchase->items()->exists()) {
+                $cart = $purchase->cart()->withTrashed()->lockForUpdate()->first();
+                if ($cart?->status === 'converted' && $cart->trashed()) {
+                    return;
+                }
 
-            foreach ($items as $item) {
-                $selection = $this->selections->resolvePurchaseItem($purchase->tenant, $item);
+                throw ValidationException::withMessages([
+                    'items' => __('api.purchase.inconsistent_reservation'),
+                ]);
+            }
 
-                try {
-                    $this->inventory->commit($selection, (int) $item->cantidad);
-                } catch (\InvalidArgumentException) {
+            $cart = $purchase->cart()->lockForUpdate()->first();
+            if ($cart === null || $cart->status !== 'checkout') {
+                throw ValidationException::withMessages([
+                    'items' => __('api.purchase.inconsistent_reservation'),
+                ]);
+            }
+
+            $cartItems = $cart->items()->orderBy('id')->lockForUpdate()->get();
+            if ($cartItems->isEmpty()) {
+                throw ValidationException::withMessages([
+                    'items' => __('api.purchase.inconsistent_reservation'),
+                ]);
+            }
+
+            $this->loadCartItems($cartItems);
+            $purchase->items()->createMany(
+                $this->snapshots->fromCartItems($cartItems),
+            );
+
+            foreach ($cartItems as $cartItem) {
+                $selection = $cartItem->selectedItem();
+                if ($selection === null) {
                     throw ValidationException::withMessages([
                         'items' => __('api.purchase.inconsistent_reservation'),
                     ]);
                 }
 
-                $item->update([
-                    'reservation_status' => PurchaseItem::RESERVATION_COMMITTED,
-                ]);
+                try {
+                    $this->reservations->commit($cartItem, $selection);
+                } catch (\InvalidArgumentException) {
+                    throw ValidationException::withMessages([
+                        'items' => __('api.purchase.inconsistent_reservation'),
+                    ]);
+                }
             }
 
             $this->sourceCart->finalize($purchase);
@@ -126,6 +154,30 @@ class CompleteCheckoutService
 
     private function loadPurchase(Purchase $purchase): Purchase
     {
-        return $purchase->load(['items.imageAttachment']);
+        return $purchase->load([
+            'items.imageAttachment',
+            'cart.items.catalogItem.inventory',
+            'cart.items.catalogItem.attachments',
+            'cart.items.variant.inventory',
+            'cart.items.variant.attachments',
+            'cart.items.variant.definitions.itemAttribute.attribute',
+            'cart.items.variant.eventDates',
+            'cart.items.variant.eventDate',
+        ]);
+    }
+
+    /** @param Collection<int, CartItem> $cartItems */
+    private function loadCartItems(Collection $cartItems): void
+    {
+        $cartItems->load([
+            'catalogItem.inventory',
+            'catalogItem.attachments',
+            'variant.inventory',
+            'variant.attachments',
+            'variant.catalogItem',
+            'variant.definitions.itemAttribute.attribute',
+            'variant.eventDates',
+            'variant.eventDate',
+        ]);
     }
 }

app/Domains/Purchase/Services/Checkout/EditCheckoutService.php

@@ -2,24 +2,12 @@
 
 namespace App\Domains\Purchase\Services\Checkout;
 
-use App\Domains\Catalog\Models\Variant;
-use App\Domains\Catalog\Services\CatalogInventoryService;
 use App\Domains\Purchase\Models\Purchase;
-use App\Domains\Purchase\Models\PurchaseItem;
-use App\Domains\Purchase\Services\UserPurchaseLimitService;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Validation\ValidationException;
-use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 
 class EditCheckoutService
 {
-    public function __construct(
-        private readonly CatalogInventoryService $inventory,
-        private readonly UserPurchaseLimitService $purchaseLimits,
-        private readonly CatalogSelectionResolver $selections,
-        private readonly SourceCartService $sourceCart,
-    ) {}
-
     /** @param array<string, string> $customerData */
     public function updateCustomer(Purchase $purchase, array $customerData): Purchase
     {
@@ -33,115 +21,6 @@ class EditCheckoutService
         });
     }
 
-    public function updateItemQuantity(
-        Purchase $purchase,
-        PurchaseItem $purchaseItem,
-        int $quantity,
-    ): Purchase {
-        return DB::transaction(function () use ($purchase, $purchaseItem, $quantity): Purchase {
-            $purchase = $this->lockPurchase($purchase);
-
-            if ($purchase->status !== Purchase::STATUS_CREATED || $this->hasExpired($purchase)) {
-                throw ValidationException::withMessages([
-                    'purchase' => __('api.purchase.not_editable'),
-                ]);
-            }
-
-            $purchaseItem = $this->lockPurchaseItem($purchase, $purchaseItem);
-            $difference = $quantity - (int) $purchaseItem->cantidad;
-
-            if ($difference !== 0) {
-                $this->adjustReservation($purchase, $purchaseItem, $quantity, $difference);
-
-                $purchaseItem->update([
-                    'cantidad' => $quantity,
-                    'total' => (float) $purchaseItem->precio_unitario * $quantity,
-                ]);
-                $this->sourceCart->syncItemQuantity($purchase, $purchaseItem, $quantity);
-            }
-
-            $purchase->update([
-                'total' => $purchase->calculateCurrentTotalAmount(),
-            ]);
-
-            return $this->loadPurchase($purchase);
-        });
-    }
-
-    public function prepareItemEditing(Purchase $purchase): Purchase
-    {
-        return DB::transaction(function () use ($purchase): Purchase {
-            $purchase = $this->lockPurchase($purchase);
-            $this->assertEditable($purchase);
-
-            $purchase->telepagosQr()->delete();
-            $purchase->update([
-                'status' => Purchase::STATUS_CREATED,
-                'payment_method' => null,
-                'transfer_payer_dni' => null,
-                'expires_at' => now()->addMinutes(
-                    max(1, (int) config('purchase.checkout_expiration_minutes', 30)),
-                ),
-            ]);
-
-            return $this->loadPurchase($purchase);
-        });
-    }
-
-    private function adjustReservation(
-        Purchase $purchase,
-        PurchaseItem $purchaseItem,
-        int $quantity,
-        int $difference,
-    ): void {
-        $selection = $this->selections->resolvePurchaseItem($purchase->tenant, $purchaseItem);
-
-        try {
-            if ($difference > 0) {
-                $otherItemQuantity = (int) $purchase->items()
-                    ->where('source_catalog_item_id', $purchaseItem->source_catalog_item_id)
-                    ->whereKeyNot($purchaseItem->getKey())
-                    ->sum('cantidad');
-                $catalogItem = $selection instanceof Variant ? $selection->catalogItem : $selection;
-
-                $this->purchaseLimits->assertCanPurchase(
-                    $catalogItem,
-                    (int) $purchase->user_id,
-                    $otherItemQuantity + $quantity,
-                    $purchase->getKey(),
-                );
-                $this->inventory->reserve($selection, $difference);
-            } else {
-                $this->inventory->release($selection, abs($difference));
-            }
-        } catch (\InvalidArgumentException) {
-            throw ValidationException::withMessages([
-                'quantity' => __('api.purchase.insufficient_stock'),
-            ]);
-        }
-    }
-
-    private function lockPurchaseItem(Purchase $purchase, PurchaseItem $item): PurchaseItem
-    {
-        /** @var PurchaseItem|null $lockedItem */
-        $lockedItem = $purchase->items()
-            ->whereKey($item->getKey())
-            ->lockForUpdate()
-            ->first();
-
-        if ($lockedItem === null) {
-            throw new NotFoundHttpException('Purchase item not found.');
-        }
-
-        if ($lockedItem->reservation_status !== PurchaseItem::RESERVATION_ACTIVE) {
-            throw ValidationException::withMessages([
-                'item' => __('api.purchase.item_not_editable'),
-            ]);
-        }
-
-        return $lockedItem;
-    }
-
     private function assertEditable(Purchase $purchase): void
     {
         if (
@@ -170,6 +49,15 @@ class EditCheckoutService
 
     private function loadPurchase(Purchase $purchase): Purchase
     {
-        return $purchase->load(['items.imageAttachment']);
+        return $purchase->load([
+            'items.imageAttachment',
+            'cart.items.catalogItem.inventory',
+            'cart.items.catalogItem.attachments',
+            'cart.items.variant.inventory',
+            'cart.items.variant.attachments',
+            'cart.items.variant.definitions.itemAttribute.attribute',
+            'cart.items.variant.eventDates',
+            'cart.items.variant.eventDate',
+        ]);
     }
 }

app/Domains/Purchase/Services/Checkout/PurchaseItemSnapshotFactory.php

@@ -5,7 +5,6 @@ namespace App\Domains\Purchase\Services\Checkout;
 use App\Domains\Attachable\Models\Attachment;
 use App\Domains\Cart\Models\CartItem;
 use App\Domains\Catalog\Models\Variant;
-use App\Domains\Purchase\Models\PurchaseItem;
 use Illuminate\Support\Collection;
 
 class PurchaseItemSnapshotFactory
@@ -38,7 +37,6 @@ class PurchaseItemSnapshotFactory
                     'discount_total' => null,
                     'tax_total' => null,
                     'total' => $unitPrice * $quantity,
-                    'reservation_status' => PurchaseItem::RESERVATION_ACTIVE,
                 ];
             })
             ->all();

app/Domains/Purchase/Services/Checkout/ReleaseCheckoutService.php

@@ -2,17 +2,16 @@
 
 namespace App\Domains\Purchase\Services\Checkout;
 
-use App\Domains\Catalog\Services\CatalogInventoryService;
+use App\Domains\Catalog\Models\StockReservation;
+use App\Domains\Catalog\Services\StockReservationService;
 use App\Domains\Purchase\Models\Purchase;
-use App\Domains\Purchase\Models\PurchaseItem;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Validation\ValidationException;
 
 class ReleaseCheckoutService
 {
     public function __construct(
-        private readonly CatalogInventoryService $inventory,
-        private readonly CatalogSelectionResolver $selections,
+        private readonly StockReservationService $reservations,
         private readonly SourceCartService $sourceCart,
     ) {}
 
@@ -77,38 +76,71 @@ class ReleaseCheckoutService
                 return $this->loadPurchase($purchase);
             }
 
-            $items = $purchase->items()
-                ->where('reservation_status', PurchaseItem::RESERVATION_ACTIVE)
-                ->lockForUpdate()
-                ->get();
-            $reservationReturnedToCart = $restoreCart && $this->sourceCart->restore($purchase);
-
-            foreach ($items as $item) {
-                if (! $reservationReturnedToCart) {
-                    $this->releaseInventory($purchase, $item);
-                }
-
-                $item->update([
-                    'reservation_status' => PurchaseItem::RESERVATION_RELEASED,
+            if ($purchase->items()->exists()) {
+                throw ValidationException::withMessages([
+                    'items' => __('api.purchase.inconsistent_reservation'),
                 ]);
             }
 
+            $reservationReturnedToCart = $restoreCart && $this->sourceCart->restore($purchase);
+            $this->releaseCartReservations($purchase, $reservationReturnedToCart, $targetStatus);
+
             $purchase->update(['status' => $targetStatus]);
 
             return $this->loadPurchase($purchase);
         });
     }
 
-    private function releaseInventory(Purchase $purchase, PurchaseItem $item): void
-    {
-        $selection = $this->selections->resolvePurchaseItem($purchase->tenant, $item);
+    private function releaseCartReservations(
+        Purchase $purchase,
+        bool $reservationReturnedToCart,
+        string $targetStatus,
+    ): void {
+        if ($reservationReturnedToCart) {
+            $this->reservations->detachFromPurchase($purchase);
 
-        try {
-            $this->inventory->release($selection, (int) $item->cantidad);
-        } catch (\InvalidArgumentException) {
-            throw ValidationException::withMessages([
-                'items' => __('api.purchase.inconsistent_reservation'),
-            ]);
+            return;
+        }
+
+        $cart = $purchase->cart()->withTrashed()->lockForUpdate()->first();
+        if ($cart === null) {
+            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'),
+                ]);
+            }
+        }
+
+        if (! $cart->trashed()) {
+            $cart->update(['status' => 'converted']);
+            $cart->delete();
         }
     }
 
@@ -129,6 +161,15 @@ class ReleaseCheckoutService
 
     private function loadPurchase(Purchase $purchase): Purchase
     {
-        return $purchase->load(['items.imageAttachment']);
+        return $purchase->load([
+            'items.imageAttachment',
+            'cart.items.catalogItem.inventory',
+            'cart.items.catalogItem.attachments',
+            'cart.items.variant.inventory',
+            'cart.items.variant.attachments',
+            'cart.items.variant.definitions.itemAttribute.attribute',
+            'cart.items.variant.eventDates',
+            'cart.items.variant.eventDate',
+        ]);
     }
 }

app/Domains/Purchase/Services/Checkout/SourceCartService.php

@@ -4,11 +4,15 @@ namespace App\Domains\Purchase\Services\Checkout;
 
 use App\Domains\Cart\Models\Cart;
 use App\Domains\Cart\Models\CartItem;
+use App\Domains\Catalog\Services\StockReservationService;
 use App\Domains\Purchase\Models\Purchase;
-use App\Domains\Purchase\Models\PurchaseItem;
 
 class SourceCartService
 {
+    public function __construct(
+        private readonly StockReservationService $reservations,
+    ) {}
+
     public function restore(Purchase $purchase): bool
     {
         $sourceCart = $this->findSourceCart($purchase);
@@ -17,6 +21,10 @@ class SourceCartService
             return false;
         }
 
+        if ($sourceCart->origin === Cart::ORIGIN_DIRECT_CHECKOUT) {
+            return false;
+        }
+
         /** @var Cart|null $activeCart */
         $activeCart = Cart::query()
             ->where('tenant_codigo', $purchase->tenant_codigo)
@@ -54,23 +62,6 @@ class SourceCartService
         return true;
     }
 
-    public function syncItemQuantity(
-        Purchase $purchase,
-        PurchaseItem $purchaseItem,
-        int $quantity,
-    ): void {
-        $sourceCart = $this->findSourceCart($purchase);
-
-        if ($sourceCart === null) {
-            return;
-        }
-
-        $sourceCart->items()
-            ->where('catalog_item_id', $purchaseItem->source_catalog_item_id)
-            ->where('variant_id', $purchaseItem->source_variant_id)
-            ->update(['cantidad' => $quantity]);
-    }
-
     public function finalize(Purchase $purchase): void
     {
         $sourceCart = $this->findSourceCart($purchase);
@@ -112,7 +103,7 @@ class SourceCartService
                 ->first();
 
             if ($activeItem === null) {
-                $activeCart->items()->create([
+                $activeItem = $activeCart->items()->create([
                     'catalog_item_id' => $sourceItem->catalog_item_id,
                     'variant_id' => $sourceItem->variant_id,
                     'cantidad' => $sourceItem->cantidad,
@@ -120,6 +111,8 @@ class SourceCartService
             } else {
                 $activeItem->increment('cantidad', (int) $sourceItem->cantidad);
             }
+
+            $this->reservations->transfer($sourceItem, $activeItem);
         }
     }
 }

app/Domains/Purchase/Services/Checkout/StartCheckoutService.php

@@ -7,6 +7,7 @@ use App\Domains\Cart\Models\CartItem;
 use App\Domains\Catalog\Models\CatalogItem;
 use App\Domains\Catalog\Models\Variant;
 use App\Domains\Catalog\Services\CatalogInventoryService;
+use App\Domains\Catalog\Services\StockReservationService;
 use App\Domains\Purchase\Exceptions\InsufficientStockException;
 use App\Domains\Purchase\Models\Purchase;
 use App\Domains\Purchase\Services\UserPurchaseLimitService;
@@ -20,9 +21,9 @@ class StartCheckoutService
 {
     public function __construct(
         private readonly CatalogInventoryService $inventory,
+        private readonly StockReservationService $reservations,
         private readonly UserPurchaseLimitService $purchaseLimits,
         private readonly CatalogSelectionResolver $selections,
-        private readonly PurchaseItemSnapshotFactory $snapshots,
         private readonly InsufficientStockMessageBuilder $stockMessages,
     ) {}
 
@@ -144,9 +145,24 @@ class StartCheckoutService
             throw new InsufficientStockException($unavailableItems);
         }
 
+        $cart = Cart::query()->create([
+            'tenant_codigo' => $tenant->codigo,
+            'user_id' => $userId,
+            'guest_token' => null,
+            'status' => 'checkout',
+            'origin' => Cart::ORIGIN_DIRECT_CHECKOUT,
+        ]);
+
+        $cartItems = collect();
         foreach ($resolvedLines as $line) {
+            $cartItem = $cart->items()->create([
+                'catalog_item_id' => $line['catalog_item_id'],
+                'variant_id' => $line['variant_id'],
+                'cantidad' => $line['quantity'],
+            ]);
+
             try {
-                $this->inventory->reserve($line['selection'], $line['quantity']);
+                $this->reservations->reserve($cartItem, $line['selection'], $line['quantity']);
             } catch (\InvalidArgumentException) {
                 $availableQuantity = $this->inventory->availableQuantity($line['selection']) ?? 0;
 
@@ -154,6 +170,10 @@ class StartCheckoutService
                     $this->unavailableItem($line, $availableQuantity),
                 ]);
             }
+
+            $cartItem->setRelation('catalogItem', $line['catalog_item']);
+            $cartItem->setRelation('variant', $line['selection'] instanceof Variant ? $line['selection'] : null);
+            $cartItems->push($cartItem);
         }
 
         $purchase = $this->createPurchase(
@@ -163,19 +183,16 @@ class StartCheckoutService
             (float) $resolvedLines->sum(
                 fn (array $line): float => $line['selection']->getPrice() * $line['quantity'],
             ),
-            null,
+            $cart->getKey(),
         );
 
-        $directCartItems = $resolvedLines->map(fn (array $line): CartItem => $this->makeDirectCartItem(
-            $line['selection'],
-            $line['catalog_item_id'],
-            $line['variant_id'],
-            $line['quantity'],
-        ));
-
-        $purchase->items()->createMany(
-            $this->snapshots->fromCartItems($directCartItems),
-        );
+        foreach ($cartItems as $index => $cartItem) {
+            $this->reservations->attachToPurchase(
+                $cartItem,
+                $resolvedLines->get($index)['selection'],
+                $purchase,
+            );
+        }
 
         return $this->loadPurchase($purchase);
     }
@@ -235,7 +252,13 @@ class StartCheckoutService
             $cart->getTotalAmount(),
             $cart->getKey(),
         );
-        $purchase->items()->createMany($this->snapshots->fromCartItems($cartItems));
+        foreach ($cartItems as $cartItem) {
+            $this->reservations->attachToPurchase(
+                $cartItem,
+                $cartItem->selectedItem(),
+                $purchase,
+            );
+        }
 
         // The purchase owns the reservation until checkout finishes. The cart is
         // retained so it can be restored if the purchase is cancelled or expires.
@@ -336,35 +359,6 @@ class StartCheckoutService
         ]);
     }
 
-    private function makeDirectCartItem(
-        CatalogItem|Variant $selection,
-        int $catalogItemId,
-        ?int $variantId,
-        int $quantity,
-    ): CartItem {
-        $catalogItem = $selection instanceof Variant ? $selection->catalogItem : $selection;
-        $catalogItem->loadMissing(['inventory', 'attachments']);
-
-        if ($selection instanceof Variant) {
-            $selection->loadMissing([
-                'inventory',
-                'attachments',
-                'catalogItem',
-                'definitions.itemAttribute.attribute',
-            ]);
-        }
-
-        $item = new CartItem([
-            'catalog_item_id' => $catalogItemId,
-            'variant_id' => $variantId,
-            'cantidad' => $quantity,
-        ]);
-        $item->setRelation('catalogItem', $catalogItem);
-        $item->setRelation('variant', $selection instanceof Variant ? $selection : null);
-
-        return $item;
-    }
-
     /** @param Collection<int, CartItem> $cartItems */
     private function loadCartItems(Collection $cartItems): void
     {
@@ -382,6 +376,15 @@ class StartCheckoutService
 
     private function loadPurchase(Purchase $purchase): Purchase
     {
-        return $purchase->load(['items.imageAttachment']);
+        return $purchase->load([
+            'items.imageAttachment',
+            'cart.items.catalogItem.inventory',
+            'cart.items.catalogItem.attachments',
+            'cart.items.variant.inventory',
+            'cart.items.variant.attachments',
+            'cart.items.variant.definitions.itemAttribute.attribute',
+            'cart.items.variant.eventDates',
+            'cart.items.variant.eventDate',
+        ]);
     }
 }

app/Domains/Purchase/Services/CheckoutService.php

@@ -2,8 +2,8 @@
 
 namespace App\Domains\Purchase\Services;
 
+use App\Domains\Catalog\Services\StockReservationService;
 use App\Domains\Purchase\Models\Purchase;
-use App\Domains\Purchase\Models\PurchaseItem;
 use App\Domains\Purchase\Services\Checkout\CompleteCheckoutService;
 use App\Domains\Purchase\Services\Checkout\EditCheckoutService;
 use App\Domains\Purchase\Services\Checkout\ReleaseCheckoutService;
@@ -23,6 +23,7 @@ class CheckoutService
         private readonly EditCheckoutService $editor,
         private readonly CompleteCheckoutService $completer,
         private readonly ReleaseCheckoutService $releaser,
+        private readonly StockReservationService $reservations,
     ) {}
 
     /** @param array<string, mixed> $purchaseData */
@@ -47,19 +48,6 @@ class CheckoutService
         return $this->editor->updateCustomer($purchase, $customerData);
     }
 
-    public function updateItemQuantity(
-        Purchase $purchase,
-        PurchaseItem $purchaseItem,
-        int $quantity,
-    ): Purchase {
-        return $this->editor->updateItemQuantity($purchase, $purchaseItem, $quantity);
-    }
-
-    public function prepareItemEditing(Purchase $purchase): Purchase
-    {
-        return $this->editor->prepareItemEditing($purchase);
-    }
-
     public function confirmPurchase(Purchase $purchase): void
     {
         $this->completer->confirm($purchase);
@@ -94,4 +82,9 @@ class CheckoutService
     {
         return $this->releaser->expireOverdue();
     }
+
+    public function syncReservationExpiration(Purchase $purchase): void
+    {
+        $this->reservations->syncPurchaseExpiration($purchase);
+    }
 }

app/Domains/Purchase/Services/UserPurchaseLimitService.php

@@ -2,6 +2,7 @@
 
 namespace App\Domains\Purchase\Services;
 
+use App\Domains\Cart\Models\CartItem;
 use App\Domains\Catalog\Models\CatalogItem;
 use App\Domains\Purchase\Models\Purchase;
 use App\Domains\Purchase\Models\PurchaseItem;
@@ -52,7 +53,24 @@ class UserPurchaseLimitService
                 })
                 ->sum('cantidad');
 
-            if ($purchasedQuantity + $requestedQuantity > $limit) {
+            $checkoutQuantity = (int) CartItem::query()
+                ->where('catalog_item_id', $catalogItem->getKey())
+                ->whereHas('cart.purchases', function ($query) use ($userId, $excludedPurchaseId): void {
+                    $query
+                        ->where('user_id', $userId)
+                        ->whereIn('status', [
+                            Purchase::STATUS_CREATED,
+                            Purchase::STATUS_PENDING_PAYMENT,
+                        ])
+                        ->whereDoesntHave('items')
+                        ->when(
+                            $excludedPurchaseId !== null,
+                            fn ($query) => $query->whereKeyNot($excludedPurchaseId),
+                        );
+                })
+                ->sum('cantidad');
+
+            if ($purchasedQuantity + $checkoutQuantity + $requestedQuantity > $limit) {
                 throw ValidationException::withMessages([
                     $field => __('api.purchase_limit.exceeded', ['max' => $limit]),
                 ]);

app/Domains/Purchase/documentacion/README.md

@@ -2,12 +2,12 @@
 
 ## Propósito
 
-Implementa el ciclo de compra y checkout: crea una compra desde el carrito, toma una instantánea de sus ítems, reserva inventario, permite ediciones, inicia el pago y confirma, cancela o vence la operación.
+Implementa el ciclo de compra y checkout: crea la cabecera de compra desde un carrito, mantiene sus líneas vivas contra catálogo durante el checkout, inicia el pago y materializa el snapshot definitivo al confirmar, o cancela y vence la operación.
 
 ## Modelo
 
 - `Purchase`: raíz de la compra; estados `created`, `pending_payment`, `paid`, `cancelled`, `rejected` y `expired`.
-- `PurchaseItem`: snapshot del producto o variante, cantidad, precio y total al comprar.
+- `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.
 
@@ -15,13 +15,17 @@ Implementa el ciclo de compra y checkout: crea una compra desde el carrito, toma
 
 `CheckoutService` es la fachada estable. Delega en:
 
-- `StartCheckoutService`: inicia la compra desde el carrito.
-- `EditCheckoutService`: modifica cliente o cantidades antes del cierre.
-- `CompleteCheckoutService`: completa, envía a revisión o confirma el pago.
+- `StartCheckoutService`: inicia la compra desde el carrito o crea un carrito técnico para compra directa, sin crear todavía `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.
-- `SourceCartService`: sincroniza, restaura o finaliza el carrito fuente.
+- `SourceCartService`: restaura o finaliza el carrito fuente.
 - `CatalogSelectionResolver` y `PurchaseItemSnapshotFactory`: resuelven selecciones y generan snapshots.
 
+Durante `created` y `pending_payment`, `PurchaseResource` publica las líneas del carrito con `items_source=cart`; una compra materializada publica `items_source=purchase`. Los datos descriptivos y económicos del checkout se resuelven siempre desde el catálogo vigente.
+
+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.
+
 `UserPurchaseLimitService` controla límites de compra y `CheckoutService` conserva el punto de entrada para controladores e integraciones.
 
 ## Endpoints

app/Domains/Purchase/routes/api.php

@@ -7,8 +7,6 @@ Route::prefix('tenants/{tenant:codigo}')->middleware('auth:sanctum')->group(func
     Route::get('compras', [PurchaseController::class, 'index']);
     Route::post('compras/start-checkout', [PurchaseController::class, 'startCheckout']);
     Route::get('compras/{compra}', [PurchaseController::class, 'show']);
-    Route::post('compras/{compra}/edit-items', [PurchaseController::class, 'prepareItemEditing']);
-    Route::patch('compras/{compra}/items/{item}', [PurchaseController::class, 'updateItemQuantity']);
     Route::patch('compras/{compra}/customer-data', [PurchaseController::class, 'updateCustomerData']);
     Route::post('compras/{compra}/payment-intent', [PurchaseController::class, 'paymentIntent']);
     Route::post('compras/{compra}/complete', [PurchaseController::class, 'complete']);