refactor(checkout): materialize purchase items on confirmation

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', [