diff --git a/app/Domains/Purchase/Controllers/PurchaseController.php b/app/Domains/Purchase/Controllers/PurchaseController.php
index fbb56f4..440d6a5 100644
--- a/app/Domains/Purchase/Controllers/PurchaseController.php
+++ b/app/Domains/Purchase/Controllers/PurchaseController.php
@@ -4,7 +4,6 @@ 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;
@@ -56,7 +55,16 @@ 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);
@@ -79,7 +87,7 @@ class PurchaseController extends Controller
         UpdatePurchaseItemQuantityRequest $request,
         Tenant $tenant,
         Purchase $compra,
-        PurchaseItem $item,
+        int $item,
         CheckoutService $checkoutService,
     ): PurchaseResource {
         $compra = $this->resolveScopedPurchase($tenant, $request->user()->id, $compra);
@@ -106,8 +114,12 @@ class PurchaseController extends Controller
         );
     }
 
-    public function paymentIntent(PaymentIntentRequest $request, Tenant $tenant, Purchase $compra): JsonResponse
-    {
+    public function paymentIntent(
+        PaymentIntentRequest $request,
+        Tenant $tenant,
+        Purchase $compra,
+        CheckoutService $checkoutService,
+    ): JsonResponse {
         $compra = $this->resolveScopedPurchase($tenant, $request->user()->id, $compra);
         $method = $request->validated('method');
         $totalAmount = $compra->calculateCurrentTotalAmount();
@@ -148,13 +160,14 @@ 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;
diff --git a/app/Domains/Purchase/Models/Purchase.php b/app/Domains/Purchase/Models/Purchase.php
index a5dcb11..7bb3d94 100644
--- a/app/Domains/Purchase/Models/Purchase.php
+++ b/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
diff --git a/app/Domains/Purchase/Resources/PurchaseItemResource.php b/app/Domains/Purchase/Resources/PurchaseItemResource.php
index 5fb2b90..bd0d700 100644
--- a/app/Domains/Purchase/Resources/PurchaseItemResource.php
+++ b/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),
             ],
diff --git a/app/Domains/Purchase/Resources/PurchaseResource.php b/app/Domains/Purchase/Resources/PurchaseResource.php
index b383adc..090b52f 100644
--- a/app/Domains/Purchase/Resources/PurchaseResource.php
+++ b/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);
     }
 
diff --git a/app/Domains/Purchase/Services/Checkout/CompleteCheckoutService.php b/app/Domains/Purchase/Services/Checkout/CompleteCheckoutService.php
index d5c2baa..09be4ef 100644
--- a/app/Domains/Purchase/Services/Checkout/CompleteCheckoutService.php
+++ b/app/Domains/Purchase/Services/Checkout/CompleteCheckoutService.php
@@ -2,9 +2,12 @@
 
 namespace App\Domains\Purchase\Services\Checkout;
 
+use App\Domains\Cart\Models\CartItem;
 use App\Domains\Catalog\Services\CatalogInventoryService;
+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;
 
@@ -12,8 +15,10 @@ class CompleteCheckoutService
 {
     public function __construct(
         private readonly CatalogInventoryService $inventory,
+        private readonly StockReservationService $reservations,
         private readonly CatalogSelectionResolver $selections,
         private readonly SourceCartService $sourceCart,
+        private readonly PurchaseItemSnapshotFactory $snapshots,
     ) {}
 
     public function complete(Purchase $purchase): Purchase
@@ -59,6 +64,7 @@ class CompleteCheckoutService
             }
 
             $purchase->update(['expires_at' => null]);
+            $this->reservations->syncPurchaseExpiration($purchase);
 
             return $this->loadPurchase($purchase);
         });
@@ -88,6 +94,51 @@ class CompleteCheckoutService
                 ->lockForUpdate()
                 ->get();
 
+            if ($items->isEmpty() && ! $purchase->items()->exists()) {
+                $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);
+                $items = $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'),
+                        ]);
+                    }
+
+                    try {
+                        $this->reservations->commit($cartItem, $selection);
+                    } catch (\InvalidArgumentException) {
+                        throw ValidationException::withMessages([
+                            'items' => __('api.purchase.inconsistent_reservation'),
+                        ]);
+                    }
+                }
+
+                $purchase->items()->update([
+                    'reservation_status' => PurchaseItem::RESERVATION_COMMITTED,
+                ]);
+                $this->sourceCart->finalize($purchase);
+
+                return;
+            }
+
             foreach ($items as $item) {
                 $selection = $this->selections->resolvePurchaseItem($purchase->tenant, $item);
 
@@ -126,6 +177,30 @@ 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',
+        ]);
     }
 }
diff --git a/app/Domains/Purchase/Services/Checkout/EditCheckoutService.php b/app/Domains/Purchase/Services/Checkout/EditCheckoutService.php
index 9491b38..6bee44a 100644
--- a/app/Domains/Purchase/Services/Checkout/EditCheckoutService.php
+++ b/app/Domains/Purchase/Services/Checkout/EditCheckoutService.php
@@ -2,8 +2,10 @@
 
 namespace App\Domains\Purchase\Services\Checkout;
 
+use App\Domains\Cart\Models\CartItem;
 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\Models\PurchaseItem;
 use App\Domains\Purchase\Services\UserPurchaseLimitService;
@@ -15,6 +17,7 @@ class EditCheckoutService
 {
     public function __construct(
         private readonly CatalogInventoryService $inventory,
+        private readonly StockReservationService $reservations,
         private readonly UserPurchaseLimitService $purchaseLimits,
         private readonly CatalogSelectionResolver $selections,
         private readonly SourceCartService $sourceCart,
@@ -35,10 +38,10 @@ class EditCheckoutService
 
     public function updateItemQuantity(
         Purchase $purchase,
-        PurchaseItem $purchaseItem,
+        int $itemId,
         int $quantity,
     ): Purchase {
-        return DB::transaction(function () use ($purchase, $purchaseItem, $quantity): Purchase {
+        return DB::transaction(function () use ($purchase, $itemId, $quantity): Purchase {
             $purchase = $this->lockPurchase($purchase);
 
             if ($purchase->status !== Purchase::STATUS_CREATED || $this->hasExpired($purchase)) {
@@ -47,7 +50,11 @@ class EditCheckoutService
                 ]);
             }
 
-            $purchaseItem = $this->lockPurchaseItem($purchase, $purchaseItem);
+            if (! $purchase->items()->exists()) {
+                return $this->updateCartItemQuantity($purchase, $itemId, $quantity);
+            }
+
+            $purchaseItem = $this->lockPurchaseItem($purchase, $itemId);
             $difference = $quantity - (int) $purchaseItem->cantidad;
 
             if ($difference !== 0) {
@@ -84,10 +91,66 @@ class EditCheckoutService
                 ),
             ]);
 
+            if (! $purchase->items()->exists()) {
+                $this->attachCartReservations($purchase);
+            }
+
             return $this->loadPurchase($purchase);
         });
     }
 
+    private function updateCartItemQuantity(Purchase $purchase, int $itemId, int $quantity): Purchase
+    {
+        $cart = $purchase->cart()->lockForUpdate()->first();
+        if ($cart === null || $cart->status !== 'checkout') {
+            throw new NotFoundHttpException('Checkout cart not found.');
+        }
+
+        /** @var CartItem|null $cartItem */
+        $cartItem = $cart->items()->whereKey($itemId)->lockForUpdate()->first();
+        if ($cartItem === null) {
+            throw new NotFoundHttpException('Checkout item not found.');
+        }
+
+        $selection = $this->selections->resolve(
+            $purchase->tenant,
+            (int) $cartItem->catalog_item_id,
+            $cartItem->variant_id === null ? null : (int) $cartItem->variant_id,
+            'item',
+        );
+        $difference = $quantity - (int) $cartItem->cantidad;
+
+        try {
+            if ($difference > 0) {
+                $otherItemQuantity = (int) $cart->items()
+                    ->where('catalog_item_id', $cartItem->catalog_item_id)
+                    ->whereKeyNot($cartItem->getKey())
+                    ->sum('cantidad');
+                $catalogItem = $selection instanceof Variant ? $selection->catalogItem : $selection;
+                $this->purchaseLimits->assertCanPurchase(
+                    $catalogItem,
+                    (int) $purchase->user_id,
+                    $otherItemQuantity + $quantity,
+                    $purchase->getKey(),
+                );
+                $this->reservations->reserve($cartItem, $selection, $difference);
+            } elseif ($difference < 0) {
+                $this->reservations->release($cartItem, $selection, abs($difference));
+            }
+        } catch (\InvalidArgumentException) {
+            throw ValidationException::withMessages([
+                'quantity' => __('api.purchase.insufficient_stock'),
+            ]);
+        }
+
+        $cartItem->update(['cantidad' => $quantity]);
+        $cart->unsetRelation('items');
+        $purchase->setRelation('cart', $cart);
+        $purchase->update(['total' => $cart->getTotalAmount()]);
+
+        return $this->loadPurchase($purchase);
+    }
+
     private function adjustReservation(
         Purchase $purchase,
         PurchaseItem $purchaseItem,
@@ -121,11 +184,11 @@ class EditCheckoutService
         }
     }
 
-    private function lockPurchaseItem(Purchase $purchase, PurchaseItem $item): PurchaseItem
+    private function lockPurchaseItem(Purchase $purchase, int $itemId): PurchaseItem
     {
         /** @var PurchaseItem|null $lockedItem */
         $lockedItem = $purchase->items()
-            ->whereKey($item->getKey())
+            ->whereKey($itemId)
             ->lockForUpdate()
             ->first();
 
@@ -142,6 +205,20 @@ class EditCheckoutService
         return $lockedItem;
     }
 
+    private function attachCartReservations(Purchase $purchase): void
+    {
+        $cartItems = $purchase->cart?->items()->lockForUpdate()->get() ?? collect();
+        foreach ($cartItems as $cartItem) {
+            $selection = $this->selections->resolve(
+                $purchase->tenant,
+                (int) $cartItem->catalog_item_id,
+                $cartItem->variant_id === null ? null : (int) $cartItem->variant_id,
+                'item',
+            );
+            $this->reservations->attachToPurchase($cartItem, $selection, $purchase);
+        }
+    }
+
     private function assertEditable(Purchase $purchase): void
     {
         if (
@@ -170,6 +247,15 @@ 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',
+        ]);
     }
 }
diff --git a/app/Domains/Purchase/Services/Checkout/ReleaseCheckoutService.php b/app/Domains/Purchase/Services/Checkout/ReleaseCheckoutService.php
index aa0ce9f..8dc3ab9 100644
--- a/app/Domains/Purchase/Services/Checkout/ReleaseCheckoutService.php
+++ b/app/Domains/Purchase/Services/Checkout/ReleaseCheckoutService.php
@@ -2,7 +2,9 @@
 
 namespace App\Domains\Purchase\Services\Checkout;
 
+use App\Domains\Catalog\Models\StockReservation;
 use App\Domains\Catalog\Services\CatalogInventoryService;
+use App\Domains\Catalog\Services\StockReservationService;
 use App\Domains\Purchase\Models\Purchase;
 use App\Domains\Purchase\Models\PurchaseItem;
 use Illuminate\Support\Facades\DB;
@@ -12,6 +14,7 @@ class ReleaseCheckoutService
 {
     public function __construct(
         private readonly CatalogInventoryService $inventory,
+        private readonly StockReservationService $reservations,
         private readonly CatalogSelectionResolver $selections,
         private readonly SourceCartService $sourceCart,
     ) {}
@@ -83,6 +86,13 @@ class ReleaseCheckoutService
                 ->get();
             $reservationReturnedToCart = $restoreCart && $this->sourceCart->restore($purchase);
 
+            if ($items->isEmpty() && ! $purchase->items()->exists()) {
+                $this->releaseCartReservations($purchase, $reservationReturnedToCart, $targetStatus);
+                $purchase->update(['status' => $targetStatus]);
+
+                return $this->loadPurchase($purchase);
+            }
+
             foreach ($items as $item) {
                 if (! $reservationReturnedToCart) {
                     $this->releaseInventory($purchase, $item);
@@ -99,6 +109,59 @@ class ReleaseCheckoutService
         });
     }
 
+    private function releaseCartReservations(
+        Purchase $purchase,
+        bool $reservationReturnedToCart,
+        string $targetStatus,
+    ): void {
+        if ($reservationReturnedToCart) {
+            $this->reservations->detachFromPurchase($purchase);
+
+            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();
+        }
+    }
+
     private function releaseInventory(Purchase $purchase, PurchaseItem $item): void
     {
         $selection = $this->selections->resolvePurchaseItem($purchase->tenant, $item);
@@ -129,6 +192,15 @@ 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',
+        ]);
     }
 }
diff --git a/app/Domains/Purchase/Services/Checkout/SourceCartService.php b/app/Domains/Purchase/Services/Checkout/SourceCartService.php
index 45624cd..d81a843 100644
--- a/app/Domains/Purchase/Services/Checkout/SourceCartService.php
+++ b/app/Domains/Purchase/Services/Checkout/SourceCartService.php
@@ -4,11 +4,16 @@ 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 +22,10 @@ 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)
@@ -112,7 +121,7 @@ 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 +129,8 @@ class SourceCartService
             } else {
                 $activeItem->increment('cantidad', (int) $sourceItem->cantidad);
             }
+
+            $this->reservations->transfer($sourceItem, $activeItem);
         }
     }
 }
diff --git a/app/Domains/Purchase/Services/Checkout/StartCheckoutService.php b/app/Domains/Purchase/Services/Checkout/StartCheckoutService.php
index 60a7ccb..f59b812 100644
--- a/app/Domains/Purchase/Services/Checkout/StartCheckoutService.php
+++ b/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',
+        ]);
     }
 }
diff --git a/app/Domains/Purchase/Services/CheckoutService.php b/app/Domains/Purchase/Services/CheckoutService.php
index b575acd..47e5c82 100644
--- a/app/Domains/Purchase/Services/CheckoutService.php
+++ b/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 */
@@ -49,10 +50,10 @@ class CheckoutService
 
     public function updateItemQuantity(
         Purchase $purchase,
-        PurchaseItem $purchaseItem,
+        int $itemId,
         int $quantity,
     ): Purchase {
-        return $this->editor->updateItemQuantity($purchase, $purchaseItem, $quantity);
+        return $this->editor->updateItemQuantity($purchase, $itemId, $quantity);
     }
 
     public function prepareItemEditing(Purchase $purchase): Purchase
@@ -94,4 +95,9 @@ class CheckoutService
     {
         return $this->releaser->expireOverdue();
     }
+
+    public function syncReservationExpiration(Purchase $purchase): void
+    {
+        $this->reservations->syncPurchaseExpiration($purchase);
+    }
 }
diff --git a/app/Domains/Purchase/Services/UserPurchaseLimitService.php b/app/Domains/Purchase/Services/UserPurchaseLimitService.php
index 8b3cc58..c45d096 100644
--- a/app/Domains/Purchase/Services/UserPurchaseLimitService.php
+++ b/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]),
                 ]);
diff --git a/app/Domains/Purchase/documentacion/README.md b/app/Domains/Purchase/documentacion/README.md
index 35d53d0..117ffbe 100644
--- a/app/Domains/Purchase/documentacion/README.md
+++ b/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 +15,15 @@ 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 cliente o cantidades del carrito de checkout 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.
 - `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.
+
 `UserPurchaseLimitService` controla límites de compra y `CheckoutService` conserva el punto de entrada para controladores e integraciones.
 
 ## Endpoints
diff --git a/tests/Feature/Integration/TelepagosWebhookTest.php b/tests/Feature/Integration/TelepagosWebhookTest.php
index b0f3f80..c17fdf5 100644
--- a/tests/Feature/Integration/TelepagosWebhookTest.php
+++ b/tests/Feature/Integration/TelepagosWebhookTest.php
@@ -193,12 +193,14 @@ class TelepagosWebhookTest extends TestCase
             'sold_units' => 1,
         ]);
 
-        $this->assertDatabaseHas('compra_items', [
+        $this->assertDatabaseMissing('compra_items', [
             'compra_id' => $newerPurchase->id,
-            'source_catalog_item_id' => $variant->catalog_item_id,
-            'source_variant_id' => $variant->id,
-            'cantidad' => 2,
-            'reservation_status' => 'active',
+        ]);
+        $this->assertDatabaseHas('stock_reservations', [
+            'purchase_id' => $newerPurchase->id,
+            'inventory_id' => $variant->inventory_id,
+            'quantity' => 2,
+            'status' => 'active',
         ]);
 
         $this->assertSoftDeleted('carritos', [
diff --git a/tests/Feature/Purchase/StorePurchaseTest.php b/tests/Feature/Purchase/StorePurchaseTest.php
index 601567a..b4fb977 100644
--- a/tests/Feature/Purchase/StorePurchaseTest.php
+++ b/tests/Feature/Purchase/StorePurchaseTest.php
@@ -30,7 +30,7 @@ class StorePurchaseTest extends TestCase
         Queue::fake();
     }
 
-    public function test_it_creates_an_independent_purchase_snapshot_from_cart(): void
+    public function test_it_starts_checkout_from_cart_without_materializing_purchase_items(): void
     {
         $tenant = $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
         $tenant->update([
@@ -90,7 +90,7 @@ class StorePurchaseTest extends TestCase
         $response->assertJsonPath('data.email', null);
         $response->assertJsonPath('data.tenant_codigo', 'sonder');
         $response->assertJsonPath('data.status', Purchase::STATUS_CREATED);
-        $response->assertJsonPath('data.items_source', 'purchase');
+        $response->assertJsonPath('data.items_source', 'cart');
         $response->assertJsonCount(1, 'data.items');
         $response->assertJsonPath('data.subtotal', '100.00');
         $response->assertJsonPath('data.total', '100.00');
@@ -109,12 +109,12 @@ class StorePurchaseTest extends TestCase
             'status' => Purchase::STATUS_CREATED,
             'total' => 100,
         ]);
-        $this->assertDatabaseHas('compra_items', [
-            'compra_id' => $purchaseId,
-            'source_catalog_item_id' => $catalogItem->id,
-            'source_variant_id' => $variant->id,
-            'cantidad' => 2,
-            'reservation_status' => 'active',
+        $this->assertDatabaseMissing('compra_items', ['compra_id' => $purchaseId]);
+        $this->assertDatabaseHas('stock_reservations', [
+            'inventory_id' => $inventory->id,
+            'purchase_id' => $purchaseId,
+            'quantity' => 2,
+            'status' => 'active',
         ]);
         $this->assertDatabaseHas('carritos', [
             'id' => $cartId,
@@ -133,9 +133,22 @@ class StorePurchaseTest extends TestCase
             'real_stock' => 10,
             'reserved_stock' => 2,
         ]);
+
+        $catalogItem->update([
+            'nombre' => 'Updated Product',
+            'precio' => '75.00',
+        ]);
+
+        $this->actingAs($user, 'sanctum')
+            ->getJson("/api/tenants/sonder/compras/{$purchaseId}")
+            ->assertOk()
+            ->assertJsonPath('data.items_source', 'cart')
+            ->assertJsonPath('data.items.0.item_details.nombre', 'Updated Product')
+            ->assertJsonPath('data.items.0.unit_price', '75.00')
+            ->assertJsonPath('data.total', '150.00');
     }
 
-    public function test_it_creates_a_direct_purchase_without_creating_or_changing_a_cart(): void
+    public function test_it_creates_a_direct_purchase_with_a_technical_checkout_cart(): void
     {
         $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
         $user = User::factory()->create();
@@ -152,18 +165,23 @@ class StorePurchaseTest extends TestCase
                 ],
             ])
             ->assertCreated()
-            ->assertJsonPath('data.cart_id', null)
-            ->assertJsonPath('data.items_source', 'purchase')
+            ->assertJsonPath('data.items_source', 'cart')
             ->assertJsonPath('data.items.0.quantity', 3)
             ->assertJsonPath('data.total', '150.00');
 
-        $this->assertDatabaseCount('carritos', 0);
-        $this->assertDatabaseHas('compra_items', [
+        $this->assertDatabaseHas('carritos', [
+            'id' => $response->json('data.cart_id'),
+            'status' => 'checkout',
+            'origin' => Cart::ORIGIN_DIRECT_CHECKOUT,
+        ]);
+        $this->assertDatabaseMissing('compra_items', [
             'compra_id' => $response->json('data.id'),
-            'source_catalog_item_id' => $variant->catalog_item_id,
-            'source_variant_id' => $variant->id,
-            'cantidad' => 3,
-            'reservation_status' => 'active',
+        ]);
+        $this->assertDatabaseHas('stock_reservations', [
+            'inventory_id' => $variant->inventory_id,
+            'purchase_id' => $response->json('data.id'),
+            'quantity' => 3,
+            'status' => 'active',
         ]);
         $this->assertDatabaseHas('inventories', [
             'id' => $variant->inventory_id,
@@ -176,9 +194,9 @@ class StorePurchaseTest extends TestCase
             ->assertOk()
             ->assertJsonPath('data.status', Purchase::STATUS_CANCELLED);
 
-        $this->assertDatabaseHas('compra_items', [
-            'compra_id' => $response->json('data.id'),
-            'reservation_status' => 'released',
+        $this->assertDatabaseHas('stock_reservations', [
+            'purchase_id' => $response->json('data.id'),
+            'status' => 'released',
         ]);
         $this->assertDatabaseHas('inventories', [
             'id' => $variant->inventory_id,
@@ -215,7 +233,7 @@ class StorePurchaseTest extends TestCase
                 ],
             ])
             ->assertCreated()
-            ->assertJsonPath('data.cart_id', null)
+            ->assertJsonPath('data.items_source', 'cart')
             ->assertJsonCount(2, 'data.items')
             ->assertJsonPath('data.items.0.source_variant_id', $firstVariant->id)
             ->assertJsonPath('data.items.1.source_variant_id', $secondVariant->id)
@@ -223,18 +241,22 @@ class StorePurchaseTest extends TestCase
 
         $purchaseId = $response->json('data.id');
 
-        $this->assertDatabaseCount('carritos', 0);
-        $this->assertDatabaseHas('compra_items', [
-            'compra_id' => $purchaseId,
-            'source_variant_id' => $firstVariant->id,
-            'cantidad' => 1,
-            'reservation_status' => 'active',
+        $this->assertDatabaseHas('carritos', [
+            'id' => $response->json('data.cart_id'),
+            'origin' => Cart::ORIGIN_DIRECT_CHECKOUT,
         ]);
-        $this->assertDatabaseHas('compra_items', [
-            'compra_id' => $purchaseId,
-            'source_variant_id' => $secondVariant->id,
-            'cantidad' => 1,
-            'reservation_status' => 'active',
+        $this->assertDatabaseMissing('compra_items', ['compra_id' => $purchaseId]);
+        $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->assertDatabaseHas('inventories', [
             'id' => $firstVariant->inventory_id,
@@ -462,7 +484,7 @@ class StorePurchaseTest extends TestCase
         ]);
     }
 
-    public function test_it_creates_purchase_items_before_checkout_and_updates_customer_data(): void
+    public function test_it_keeps_cart_items_during_checkout_and_updates_customer_data(): void
     {
         $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
         $user = User::factory()->create();
@@ -479,7 +501,7 @@ class StorePurchaseTest extends TestCase
                 ],
             ])
             ->assertCreated()
-            ->assertJsonPath('data.items_source', 'purchase')
+            ->assertJsonPath('data.items_source', 'cart')
             ->assertJsonCount(1, 'data.items')
             ->assertJsonPath('data.items.0.quantity', 2)
             ->assertJsonPath('data.dni', null)
@@ -543,7 +565,7 @@ class StorePurchaseTest extends TestCase
         $user = User::factory()->create();
         $variant = $this->createVariantForTenant('sonder', 10, '50.00');
         $purchase = $this->createCheckoutPurchase($user, 'sonder', $variant, 2);
-        $itemId = $purchase->items->firstOrFail()->id;
+        $itemId = $purchase->cart->items->firstOrFail()->id;
 
         $this->actingAs($user, 'sanctum')
             ->patchJson("/api/tenants/sonder/compras/{$purchase->id}/items/{$itemId}", [
@@ -587,7 +609,7 @@ class StorePurchaseTest extends TestCase
         $variant = $this->createVariantForTenant('sonder', 10, '50.00');
         $variant->catalogItem->update(['max_units_per_user' => 3]);
         $purchase = $this->createCheckoutPurchase($user, 'sonder', $variant, 2);
-        $itemId = $purchase->items->firstOrFail()->id;
+        $itemId = $purchase->cart->items->firstOrFail()->id;
 
         $this->actingAs($user, 'sanctum')
             ->patchJson("/api/tenants/sonder/compras/{$purchase->id}/items/{$itemId}", [
@@ -596,7 +618,7 @@ class StorePurchaseTest extends TestCase
             ->assertUnprocessable()
             ->assertJsonValidationErrors('quantity');
 
-        $this->assertDatabaseHas('compra_items', [
+        $this->assertDatabaseHas('carrito_items', [
             'id' => $itemId,
             'cantidad' => 2,
         ]);
@@ -797,9 +819,11 @@ class StorePurchaseTest extends TestCase
             'id' => $purchase->id,
             'status' => Purchase::STATUS_EXPIRED,
         ]);
-        $this->assertDatabaseHas('compra_items', [
-            'compra_id' => $purchase->id,
-            'reservation_status' => 'released',
+        $this->assertDatabaseMissing('compra_items', ['compra_id' => $purchase->id]);
+        $this->assertDatabaseHas('stock_reservations', [
+            'purchase_id' => null,
+            'quantity' => 3,
+            'status' => 'active',
         ]);
         $this->assertDatabaseHas('inventories', [
             'id' => $variant->inventory_id,
@@ -819,7 +843,7 @@ class StorePurchaseTest extends TestCase
             ->assertSuccessful();
     }
 
-    public function test_purchase_detail_uses_purchase_items_for_created_purchase(): void
+    public function test_purchase_detail_uses_cart_items_for_created_purchase(): void
     {
         $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
         $user = User::factory()->create([
@@ -832,7 +856,7 @@ class StorePurchaseTest extends TestCase
             ->getJson("/api/tenants/sonder/compras/{$purchase->id}")
             ->assertOk()
             ->assertJsonPath('data.status', Purchase::STATUS_CREATED)
-            ->assertJsonPath('data.items_source', 'purchase')
+            ->assertJsonPath('data.items_source', 'cart')
             ->assertJsonCount(1, 'data.items')
             ->assertJsonPath('data.items.0.quantity', 2)
             ->assertJsonPath('data.items.0.unit_price', '50.00')
@@ -863,7 +887,7 @@ class StorePurchaseTest extends TestCase
             'type' => AttachmentType::Image,
             'mime_type' => 'image/png',
         ]);
-        $purchase->items()->firstOrFail()->update(['image_attachment_id' => $image->id]);
+        $variant->catalogItem->attachments()->attach($image->id, ['orden' => 0]);
 
         $this->actingAs($user, 'sanctum')
             ->getJson("/api/tenants/sonder/compras/{$purchase->id}")
@@ -871,7 +895,7 @@ class StorePurchaseTest extends TestCase
             ->assertJsonPath('data.items.0.item_details.imagen', null);
     }
 
-    public function test_purchase_detail_uses_purchase_items_for_pending_payment_purchase(): void
+    public function test_purchase_detail_uses_cart_items_for_pending_payment_purchase(): void
     {
         $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
         $user = User::factory()->create([
@@ -890,7 +914,7 @@ class StorePurchaseTest extends TestCase
             ->getJson("/api/tenants/sonder/compras/{$purchase->id}")
             ->assertOk()
             ->assertJsonPath('data.status', Purchase::STATUS_PENDING_PAYMENT)
-            ->assertJsonPath('data.items_source', 'purchase')
+            ->assertJsonPath('data.items_source', 'cart')
             ->assertJsonCount(1, 'data.items')
             ->assertJsonPath('data.items.0.quantity', 2)
             ->assertJsonPath('data.items.0.unit_price', '50.00')
@@ -925,6 +949,12 @@ 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->assertSoftDeleted('carritos', [
             'id' => $purchase->cart_id,
@@ -956,7 +986,9 @@ class StorePurchaseTest extends TestCase
         $variant = $this->createVariantForTenant('sonder', 10, '50.00');
         $purchase = $this->createCheckoutPurchase($user, 'sonder', $variant, 2);
 
-        $purchase->update(['cart_id' => null]);
+        $purchase->update(['payment_method' => 'transfer']);
+        app(CheckoutService::class)->confirmPurchase($purchase);
+        $purchase->refresh()->update(['cart_id' => null]);
 
         $this->actingAs($user, 'sanctum')
             ->getJson("/api/tenants/sonder/compras/{$purchase->id}")