diff --git a/app/Domains/Cart/Models/Cart.php b/app/Domains/Cart/Models/Cart.php
index 6d15a49..b726e22 100644
--- a/app/Domains/Cart/Models/Cart.php
+++ b/app/Domains/Cart/Models/Cart.php
@@ -82,9 +82,9 @@ class Cart extends Model
         return DB::transaction(function () use ($productVariantId, $quantity): CartItem {
             $variant = $this->resolveScopedVariant($productVariantId, true);
 
-            if ($variant->stock_tecnico < $quantity) {
+            if ($variant->tracksInventory() && $variant->availableQuantity() < $quantity) {
                 throw ValidationException::withMessages([
-                    'cantidad' => "Stock insuficiente para la variante solicitada. Maximo disponible: {$variant->stock_tecnico}.",
+                    'cantidad' => "Stock insuficiente para la variante solicitada. Maximo disponible: {$variant->availableQuantity()}.",
                 ]);
             }
 
@@ -104,7 +104,7 @@ class Cart extends Model
                 $item->save();
             }
 
-            $variant->incrementReservedStock($quantity);
+            $variant->reserveStock($quantity);
 
             return $item->fresh();
         });
@@ -128,8 +128,8 @@ class Cart extends Model
             $variant = $this->resolveScopedVariant($productVariantId, true);
             $delta = $quantity - $item->cantidad;
 
-            if ($delta > 0 && $variant->stock_tecnico < $delta) {
-                $maxAvailable = $variant->stock_tecnico + $item->cantidad;
+            if ($delta > 0 && $variant->tracksInventory() && $variant->availableQuantity() < $delta) {
+                $maxAvailable = $variant->availableQuantity() + $item->cantidad;
                 throw ValidationException::withMessages([
                     'cantidad' => "El máximo que se puede agregar es {$maxAvailable}.",
                 ]);
@@ -139,7 +139,7 @@ class Cart extends Model
             $item->save();
 
             if ($delta > 0) {
-                $variant->incrementReservedStock($delta);
+                $variant->reserveStock($delta);
             }
 
             if ($delta < 0) {
diff --git a/app/Domains/Catalog/Enums/InventoryPolicy.php b/app/Domains/Catalog/Enums/InventoryPolicy.php
new file mode 100644
index 0000000..970edb8
--- /dev/null
+++ b/app/Domains/Catalog/Enums/InventoryPolicy.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace App\Domains\Catalog\Enums;
+
+enum InventoryPolicy: string
+{
+    case Tracked = 'tracked';
+    case Unlimited = 'unlimited';
+}
diff --git a/app/Domains/Catalog/Models/ProductVariant.php b/app/Domains/Catalog/Models/ProductVariant.php
index 066e7f1..f4a7a49 100644
--- a/app/Domains/Catalog/Models/ProductVariant.php
+++ b/app/Domains/Catalog/Models/ProductVariant.php
@@ -3,17 +3,18 @@
 namespace App\Domains\Catalog\Models;
 
 use App\Domains\Attachable\Models\Attachment;
+use App\Domains\Catalog\Enums\InventoryPolicy;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Casts\Attribute;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 
-use Illuminate\Database\Eloquent\Casts\Attribute;
-
 #[Fillable([
     'producto_id',
+    'inventory_policy',
     'stock_real',
     'stock_reservado',
     'stock',
@@ -30,9 +31,20 @@ class ProductVariant extends Model
 
     protected $appends = ['stock_tecnico'];
 
+    protected $attributes = [
+        'inventory_policy' => 'tracked',
+        'stock_real' => 0,
+        'stock_reservado' => 0,
+        'cantidad_vendida' => 0,
+    ];
+
     protected static function booted(): void
     {
         static::saving(function (ProductVariant $variant) {
+            if ($variant->exists && $variant->isDirty('inventory_policy')) {
+                throw new \InvalidArgumentException('La politica de inventario no puede modificarse.');
+            }
+
             $variant->validateStock();
         });
     }
@@ -47,34 +59,44 @@ class ProductVariant extends Model
             throw new \InvalidArgumentException('El stock reservado no puede ser negativo.');
         }
 
-        if ($this->stock_reservado > $this->stock_real) {
+        if ($this->cantidad_vendida < 0) {
+            throw new \InvalidArgumentException('La cantidad vendida no puede ser negativa.');
+        }
+
+        if ($this->tracksInventory() && $this->stock_reservado > $this->stock_real) {
             throw new \InvalidArgumentException('El stock reservado no puede ser mayor que el stock real.');
         }
     }
 
-    public function incrementRealStock(int $amount): void
+    public function tracksInventory(): bool
+    {
+        return $this->inventory_policy === InventoryPolicy::Tracked;
+    }
+
+    public function availableQuantity(): ?int
+    {
+        if (! $this->tracksInventory()) {
+            return null;
+        }
+
+        return $this->stock_real - $this->stock_reservado;
+    }
+
+    public function isAvailableForSale(): bool
+    {
+        return ! $this->tracksInventory() || $this->availableQuantity() > 0;
+    }
+
+    public function reserveStock(int $amount): void
     {
         if ($amount < 0) {
             throw new \InvalidArgumentException('El monto a incrementar debe ser positivo.');
         }
-        $this->stock_real += $amount;
-        $this->save();
-    }
 
-    public function decrementRealStock(int $amount): void
-    {
-        if ($amount < 0) {
-            throw new \InvalidArgumentException('El monto a decrementar debe ser positivo.');
+        if ($this->tracksInventory() && $this->availableQuantity() < $amount) {
+            throw new \InvalidArgumentException('No hay suficiente stock disponible para reservar.');
         }
-        $this->stock_real -= $amount;
-        $this->save();
-    }
 
-    public function incrementReservedStock(int $amount): void
-    {
-        if ($amount < 0) {
-            throw new \InvalidArgumentException('El monto a incrementar debe ser positivo.');
-        }
         $this->stock_reservado += $amount;
         $this->save();
     }
@@ -88,13 +110,13 @@ class ProductVariant extends Model
         $this->save();
     }
 
-    public function confirmReservedStock(int $amount): void
+    public function buy(int $amount): void
     {
         if ($amount < 0) {
             throw new \InvalidArgumentException('El monto a confirmar debe ser positivo.');
         }
 
-        if ($this->stock_real < $amount) {
+        if ($this->tracksInventory() && $this->stock_real < $amount) {
             throw new \InvalidArgumentException('No hay suficiente stock real para confirmar la reserva.');
         }
 
@@ -102,14 +124,18 @@ class ProductVariant extends Model
             throw new \InvalidArgumentException('No hay suficiente stock reservado para confirmar la reserva.');
         }
 
-        $this->stock_real -= $amount;
+        if ($this->tracksInventory()) {
+            $this->stock_real -= $amount;
+        }
+
         $this->stock_reservado -= $amount;
+        $this->cantidad_vendida += $amount;
         $this->save();
     }
 
     protected function stockTecnico(): Attribute
     {
-        return Attribute::get(fn () => $this->stock_real - $this->stock_reservado);
+        return Attribute::get(fn (): ?int => $this->availableQuantity());
     }
 
     protected function stock(): Attribute
@@ -126,8 +152,10 @@ class ProductVariant extends Model
     {
         return [
             'producto_id' => 'integer',
+            'inventory_policy' => InventoryPolicy::class,
             'stock_real' => 'integer',
             'stock_reservado' => 'integer',
+            'cantidad_vendida' => 'integer',
             'is_placeholder' => 'boolean',
             'has_tickets' => 'boolean',
             'minimum_use_date' => 'datetime',
diff --git a/app/Domains/Catalog/Requests/StoreProductRequest.php b/app/Domains/Catalog/Requests/StoreProductRequest.php
index e043328..ec48acd 100644
--- a/app/Domains/Catalog/Requests/StoreProductRequest.php
+++ b/app/Domains/Catalog/Requests/StoreProductRequest.php
@@ -2,6 +2,7 @@
 
 namespace App\Domains\Catalog\Requests;
 
+use App\Domains\Catalog\Enums\InventoryPolicy;
 use App\Domains\Shared\Rules\ImageOrBase64Rule;
 use Illuminate\Foundation\Http\FormRequest;
 use Illuminate\Validation\Rule;
@@ -32,6 +33,8 @@ class StoreProductRequest extends FormRequest
             'descripcion' => ['nullable', 'string'],
             'precio' => ['required', 'numeric', 'min:0'],
             'stock' => ['sometimes', 'integer', 'min:0'],
+            'inventory_policy' => ['sometimes', Rule::enum(InventoryPolicy::class)],
+            'cantidad_vendida' => ['prohibited'],
             'attribute_ids' => ['sometimes', 'array'],
             'attribute_ids.*' => [
                 'required',
@@ -41,7 +44,7 @@ class StoreProductRequest extends FormRequest
                 ),
             ],
             'images' => ['sometimes', 'nullable', 'array'],
-            'images.*' => ['required', new ImageOrBase64Rule()],
+            'images.*' => ['required', new ImageOrBase64Rule],
         ];
     }
 }
diff --git a/app/Domains/Catalog/Requests/StoreProductVariantRequest.php b/app/Domains/Catalog/Requests/StoreProductVariantRequest.php
index 3561ec1..5d280b9 100644
--- a/app/Domains/Catalog/Requests/StoreProductVariantRequest.php
+++ b/app/Domains/Catalog/Requests/StoreProductVariantRequest.php
@@ -2,6 +2,7 @@
 
 namespace App\Domains\Catalog\Requests;
 
+use App\Domains\Catalog\Enums\InventoryPolicy;
 use App\Domains\Shared\Rules\ImageOrBase64Rule;
 use Illuminate\Foundation\Http\FormRequest;
 use Illuminate\Validation\Rule;
@@ -20,6 +21,8 @@ class StoreProductVariantRequest extends FormRequest
     {
         return [
             'stock' => ['sometimes', 'integer', 'min:0'],
+            'inventory_policy' => ['sometimes', Rule::enum(InventoryPolicy::class)],
+            'cantidad_vendida' => ['prohibited'],
             'definitions' => ['sometimes', 'array'],
             'definitions.*.products_attribute_id' => [
                 'required',
@@ -31,7 +34,7 @@ class StoreProductVariantRequest extends FormRequest
             ],
             'definitions.*.value' => ['nullable', 'string'],
             'images' => ['sometimes', 'nullable', 'array'],
-            'images.*' => ['required', new ImageOrBase64Rule()],
+            'images.*' => ['required', new ImageOrBase64Rule],
             'has_tickets' => ['boolean'],
             'minimum_use_date' => ['nullable', 'date'],
             'maximum_use_date' => ['nullable', 'date', 'after_or_equal:minimum_use_date'],
diff --git a/app/Domains/Catalog/Requests/UpdateProductVariantRequest.php b/app/Domains/Catalog/Requests/UpdateProductVariantRequest.php
index d8dc26b..e31ea1c 100644
--- a/app/Domains/Catalog/Requests/UpdateProductVariantRequest.php
+++ b/app/Domains/Catalog/Requests/UpdateProductVariantRequest.php
@@ -20,6 +20,8 @@ class UpdateProductVariantRequest extends FormRequest
     {
         return [
             'stock' => ['sometimes', 'integer', 'min:0'],
+            'inventory_policy' => ['prohibited'],
+            'cantidad_vendida' => ['prohibited'],
             'definitions' => ['sometimes', 'array'],
             'definitions.*.products_attribute_id' => [
                 'required',
@@ -31,7 +33,7 @@ class UpdateProductVariantRequest extends FormRequest
             ],
             'definitions.*.value' => ['nullable', 'string'],
             'images' => ['sometimes', 'nullable', 'array'],
-            'images.*' => ['required', new ImageOrBase64Rule()],
+            'images.*' => ['required', new ImageOrBase64Rule],
             'has_tickets' => ['boolean'],
             'minimum_use_date' => ['nullable', 'date'],
             'maximum_use_date' => ['nullable', 'date', 'after_or_equal:minimum_use_date'],
diff --git a/app/Domains/Catalog/Resources/ProductResource.php b/app/Domains/Catalog/Resources/ProductResource.php
index 1aafa61..c48a615 100644
--- a/app/Domains/Catalog/Resources/ProductResource.php
+++ b/app/Domains/Catalog/Resources/ProductResource.php
@@ -35,7 +35,9 @@ class ProductResource extends JsonResource
             'variants_map' => $this->whenLoaded('variants', fn () => $this->variants
                 ->map(fn ($variant) => [
                     'variant_id' => $variant->id,
+                    'inventory_policy' => $variant->inventory_policy->value,
                     'cantidad_maxima' => $variant->stock_tecnico,
+                    'cantidad_vendida' => $variant->cantidad_vendida,
                     'attributes' => $variant->definitions
                         ->mapWithKeys(fn ($definition) => [
                             $definition->productAttribute?->attribute?->codigo => $definition->value,
diff --git a/app/Domains/Catalog/Resources/ProductVariantResource.php b/app/Domains/Catalog/Resources/ProductVariantResource.php
index 08baa85..9c5619f 100644
--- a/app/Domains/Catalog/Resources/ProductVariantResource.php
+++ b/app/Domains/Catalog/Resources/ProductVariantResource.php
@@ -18,7 +18,9 @@ class ProductVariantResource extends JsonResource
     {
         return [
             'id' => $this->id,
+            'inventory_policy' => $this->inventory_policy->value,
             'cantidad_maxima' => $this->stock_tecnico,
+            'cantidad_vendida' => $this->cantidad_vendida,
             'has_tickets' => $this->has_tickets,
             'minimum_use_date' => $this->minimum_use_date,
             'maximum_use_date' => $this->maximum_use_date,
diff --git a/app/Domains/Catalog/Services/ProductService.php b/app/Domains/Catalog/Services/ProductService.php
index 9599805..4f3461d 100644
--- a/app/Domains/Catalog/Services/ProductService.php
+++ b/app/Domains/Catalog/Services/ProductService.php
@@ -3,6 +3,7 @@
 namespace App\Domains\Catalog\Services;
 
 use App\Domains\Attachable\Services\AttachmentService;
+use App\Domains\Catalog\Enums\InventoryPolicy;
 use App\Domains\Catalog\Models\Attribute;
 use App\Domains\Catalog\Models\Product;
 use App\Domains\Catalog\Models\ProductVariant;
@@ -28,7 +29,8 @@ class ProductService
             $attributeIds = $data['attribute_ids'] ?? [];
             $images = $data['images'] ?? [];
             $stock = $data['stock'] ?? 0;
-            unset($data['attribute_ids'], $data['images'], $data['stock']);
+            $inventoryPolicy = $data['inventory_policy'] ?? InventoryPolicy::Tracked->value;
+            unset($data['attribute_ids'], $data['images'], $data['stock'], $data['inventory_policy']);
 
             /** @var Product $product */
             $product = Product::query()->create([
@@ -45,6 +47,7 @@ class ProductService
             // Create default variant with stock
             $this->createVariant($product, [
                 'stock' => $stock,
+                'inventory_policy' => $inventoryPolicy,
                 'is_placeholder' => true,
                 'definitions' => [],
             ]);
@@ -179,6 +182,7 @@ class ProductService
             if ($product->variants()->count() === 0) {
                 $product->createVariant([
                     'stock' => 0,
+                    'inventory_policy' => InventoryPolicy::Tracked->value,
                     'is_placeholder' => true,
                     'definitions' => [],
                 ]);
@@ -327,13 +331,13 @@ class ProductService
 
         $selectedVariant = $variantId !== null
             ? $product->variants->firstWhere('id', $variantId)
-            : $product->variants->first(fn (ProductVariant $variant) => $variant->stock_tecnico > 0);
+            : $product->variants->first(fn (ProductVariant $variant) => $variant->isAvailableForSale());
 
         if ($variantId !== null && $selectedVariant === null) {
             throw new NotFoundHttpException('Product variant not found for product.');
         }
 
-        if ($variantId !== null && $selectedVariant->stock_tecnico <= 0) {
+        if ($variantId !== null && ! $selectedVariant->isAvailableForSale()) {
             throw ValidationException::withMessages([
                 'variant_id' => 'La variante seleccionada no tiene stock.',
             ]);
diff --git a/app/Domains/Purchase/Services/CheckoutService.php b/app/Domains/Purchase/Services/CheckoutService.php
index 3aa509f..3dca897 100644
--- a/app/Domains/Purchase/Services/CheckoutService.php
+++ b/app/Domains/Purchase/Services/CheckoutService.php
@@ -97,6 +97,15 @@ class CheckoutService
     public function confirmPurchase(Purchase $purchase): void
     {
         DB::transaction(function () use ($purchase): void {
+            /** @var Purchase $purchase */
+            $purchase = Purchase::query()
+                ->lockForUpdate()
+                ->findOrFail($purchase->getKey());
+
+            if ($purchase->items()->exists()) {
+                return;
+            }
+
             /** @var Cart|null $cart */
             $cart = $purchase->cart()->lockForUpdate()->first();
 
@@ -114,10 +123,6 @@ class CheckoutService
                 ]);
             }
 
-            if ($purchase->items()->exists()) {
-                return;
-            }
-
             $cartItems->load('variant.product');
             $variants = $this->resolveTenantVariants($purchase->tenant, $cartItems);
             $purchaseItemsPayload = $this->buildPurchaseItemsPayload($cartItems, $variants);
@@ -158,7 +163,7 @@ class CheckoutService
 
     /**
      * @param  Collection<int, CartItem>  $cartItems
-     * @return \Illuminate\Support\Collection<int, ProductVariant>
+     * @return Collection<int, ProductVariant>
      */
     protected function resolveCheckoutCart(Tenant $tenant, int $userId, int $cartId): Cart
     {
@@ -218,7 +223,7 @@ class CheckoutService
             $quantity = (int) $item->cantidad;
 
             try {
-                $variant->confirmReservedStock($quantity);
+                $variant->buy($quantity);
             } catch (\InvalidArgumentException $exception) {
                 throw ValidationException::withMessages([
                     'cart_id' => 'The selected cart has inconsistent stock state.',
diff --git a/database/migrations/2026_07_15_000000_add_inventory_policy_and_cantidad_vendida_to_productos_variantes_table.php b/database/migrations/2026_07_15_000000_add_inventory_policy_and_cantidad_vendida_to_productos_variantes_table.php
new file mode 100644
index 0000000..cad7b33
--- /dev/null
+++ b/database/migrations/2026_07_15_000000_add_inventory_policy_and_cantidad_vendida_to_productos_variantes_table.php
@@ -0,0 +1,29 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('productos_variantes', function (Blueprint $table) {
+            $table->string('inventory_policy')->default('tracked')->after('producto_id');
+            $table->unsignedBigInteger('cantidad_vendida')->default(0)->after('stock_reservado');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('productos_variantes', function (Blueprint $table) {
+            $table->dropColumn(['inventory_policy', 'cantidad_vendida']);
+        });
+    }
+};
diff --git a/tests/Feature/Cart/CartControllerTest.php b/tests/Feature/Cart/CartControllerTest.php
index fc10d69..6f68ca7 100644
--- a/tests/Feature/Cart/CartControllerTest.php
+++ b/tests/Feature/Cart/CartControllerTest.php
@@ -2,14 +2,19 @@
 
 namespace Tests\Feature\Cart;
 
+use App\Domains\Attachable\Enums\AttachmentType;
+use App\Domains\Attachable\Models\Attachment;
 use App\Domains\Auth\Models\User;
-use App\Domains\Catalog\Models\Product;
+use App\Domains\Catalog\Enums\InventoryPolicy;
 use App\Domains\Catalog\Models\Attribute;
-use App\Domains\Catalog\Models\ProductVariant;
+use App\Domains\Catalog\Models\Category;
+use App\Domains\Catalog\Models\Product;
 use App\Domains\Catalog\Models\ProductAttribute;
+use App\Domains\Catalog\Models\ProductVariant;
 use App\Domains\Catalog\Models\ProductVariantDefinition;
 use App\Domains\Tenant\Models\Tenant;
 use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Str;
 use Tests\TestCase;
 
 class CartControllerTest extends TestCase
@@ -29,7 +34,7 @@ class CartControllerTest extends TestCase
                     'status' => 'active',
                     'items' => [],
                     'subtotal' => '0.00',
-                ]
+                ],
             ]);
     }
 
@@ -315,18 +320,73 @@ class CartControllerTest extends TestCase
             ->assertJsonValidationErrors(['cantidad' => 'El máximo que se puede agregar es 2.']);
     }
 
+    public function test_unlimited_inventory_can_be_reserved_updated_and_released_without_real_stock(): void
+    {
+        $variant = $this->createVariantForTenant(
+            'acme',
+            0,
+            '10.00',
+            'unlimited',
+            InventoryPolicy::Unlimited,
+        );
+
+        $response = $this->postJson('/api/tenants/acme/cart/items', [
+            'product_variant_id' => $variant->id,
+            'cantidad' => 100,
+        ])->assertOk();
+
+        $guestToken = $response->getCookie('guest_token', false)?->getValue();
+        $this->assertDatabaseHas('productos_variantes', [
+            'id' => $variant->id,
+            'stock_real' => 0,
+            'stock_reservado' => 100,
+        ]);
+
+        $this->call(
+            'PATCH',
+            "/api/tenants/acme/cart/items/{$variant->id}",
+            [],
+            ['guest_token' => $guestToken],
+            [],
+            ['HTTP_Accept' => 'application/json', 'CONTENT_TYPE' => 'application/json'],
+            json_encode(['cantidad' => 150]),
+        )->assertOk();
+
+        $this->assertDatabaseHas('productos_variantes', [
+            'id' => $variant->id,
+            'stock_real' => 0,
+            'stock_reservado' => 150,
+        ]);
+
+        $this->call(
+            'DELETE',
+            "/api/tenants/acme/cart/items/{$variant->id}",
+            [],
+            ['guest_token' => $guestToken],
+            [],
+            ['HTTP_Accept' => 'application/json'],
+        )->assertOk();
+
+        $this->assertDatabaseHas('productos_variantes', [
+            'id' => $variant->id,
+            'stock_real' => 0,
+            'stock_reservado' => 0,
+        ]);
+    }
+
     protected function createVariantForTenant(
         string $tenantCode,
         int $stock,
         string $price,
         string $slugPrefix = 'shirt',
+        InventoryPolicy $inventoryPolicy = InventoryPolicy::Tracked,
     ): ProductVariant {
         $tenant = Tenant::query()->where('codigo', $tenantCode)->first();
         if (! $tenant) {
             $this->createTenant($tenantCode, ucfirst($tenantCode), "{$tenantCode}.com");
         }
 
-        $category = \App\Domains\Catalog\Models\Category::query()->create([
+        $category = Category::query()->create([
             'tenant_code' => $tenantCode,
             'nombre' => "{$slugPrefix} category {$tenantCode}",
         ]);
@@ -342,6 +402,7 @@ class CartControllerTest extends TestCase
 
         return ProductVariant::query()->create([
             'producto_id' => $product->id,
+            'inventory_policy' => $inventoryPolicy->value,
             'slug' => "{$slugPrefix}-variant-".ProductVariant::query()->count(),
             'nombre' => ucfirst($slugPrefix).' Variant',
             'stock' => $stock,
@@ -352,21 +413,21 @@ class CartControllerTest extends TestCase
 
     protected function createTenant(string $codigo, string $nombre, string $dominio): Tenant
     {
-        $hdrKey = (string) \Illuminate\Support\Str::uuid();
-        $ftrKey = (string) \Illuminate\Support\Str::uuid();
+        $hdrKey = (string) Str::uuid();
+        $ftrKey = (string) Str::uuid();
 
-        $headerAttachment = \App\Domains\Attachable\Models\Attachment::create([
+        $headerAttachment = Attachment::create([
             'key' => $hdrKey,
-            'path' => 'tenants/' . $hdrKey . '.png',
+            'path' => 'tenants/'.$hdrKey.'.png',
             'filename' => 'logo_header.png',
-            'type' => \App\Domains\Attachable\Enums\AttachmentType::Image,
+            'type' => AttachmentType::Image,
             'mime_type' => 'image/png',
         ]);
-        $footerAttachment = \App\Domains\Attachable\Models\Attachment::create([
+        $footerAttachment = Attachment::create([
             'key' => $ftrKey,
-            'path' => 'tenants/' . $ftrKey . '.png',
+            'path' => 'tenants/'.$ftrKey.'.png',
             'filename' => 'logo_footer.png',
-            'type' => \App\Domains\Attachable\Enums\AttachmentType::Image,
+            'type' => AttachmentType::Image,
             'mime_type' => 'image/png',
         ]);
 
diff --git a/tests/Feature/Catalog/ProductControllerTest.php b/tests/Feature/Catalog/ProductControllerTest.php
index 1d32724..810ea0f 100644
--- a/tests/Feature/Catalog/ProductControllerTest.php
+++ b/tests/Feature/Catalog/ProductControllerTest.php
@@ -4,6 +4,7 @@ namespace Tests\Feature\Catalog;
 
 use App\Domains\Attachable\Enums\AttachmentType;
 use App\Domains\Attachable\Models\Attachment;
+use App\Domains\Catalog\Enums\InventoryPolicy;
 use App\Domains\Catalog\Models\Attribute;
 use App\Domains\Catalog\Models\Brand;
 use App\Domains\Catalog\Models\Product;
@@ -768,6 +769,67 @@ class ProductControllerTest extends TestCase
         $response->assertJsonValidationErrors(['variant_id']);
     }
 
+    public function test_it_creates_an_unlimited_default_variant_and_exposes_inventory_fields(): void
+    {
+        $response = $this->postJson("/api/tenants/{$this->tenant->codigo}/productos", [
+            'categoria_id' => 1,
+            'brand_id' => $this->brand->id,
+            'slug' => 'unlimited-product',
+            'nombre' => 'Unlimited Product',
+            'precio' => 100,
+            'stock' => 0,
+            'inventory_policy' => InventoryPolicy::Unlimited->value,
+        ]);
+
+        $response->assertCreated();
+
+        $product = Product::query()->where('slug', 'unlimited-product')->firstOrFail();
+        $variant = $product->variants()->firstOrFail();
+        $this->assertSame(InventoryPolicy::Unlimited, $variant->inventory_policy);
+
+        $this->getJson("/api/tenants/{$this->tenant->codigo}/productos/{$product->id}")
+            ->assertOk()
+            ->assertJsonPath('data.variant.id', $variant->id)
+            ->assertJsonPath('data.variant.inventory_policy', InventoryPolicy::Unlimited->value)
+            ->assertJsonPath('data.variant.cantidad_maxima', null)
+            ->assertJsonPath('data.variant.cantidad_vendida', 0)
+            ->assertJsonPath('data.variants_map.0.inventory_policy', InventoryPolicy::Unlimited->value)
+            ->assertJsonPath('data.variants_map.0.cantidad_maxima', null)
+            ->assertJsonPath('data.variants_map.0.cantidad_vendida', 0);
+    }
+
+    public function test_it_rejects_invalid_or_updated_inventory_policies(): void
+    {
+        $this->postJson("/api/tenants/{$this->tenant->codigo}/productos", [
+            'categoria_id' => 1,
+            'brand_id' => $this->brand->id,
+            'slug' => 'invalid-policy',
+            'nombre' => 'Invalid Policy',
+            'precio' => 100,
+            'inventory_policy' => 'sometimes',
+        ])->assertUnprocessable()->assertJsonValidationErrors(['inventory_policy']);
+
+        $product = Product::query()->create([
+            'tenant_codigo' => $this->tenant->codigo,
+            'categoria_id' => 1,
+            'brand_id' => $this->brand->id,
+            'slug' => 'immutable-policy',
+            'nombre' => 'Immutable Policy',
+            'precio' => 100,
+        ]);
+        $variant = $product->variants()->create([
+            'stock' => 0,
+            'inventory_policy' => InventoryPolicy::Unlimited->value,
+        ]);
+
+        $this->putJson(
+            "/api/tenants/{$this->tenant->codigo}/productos/{$product->id}/variants/{$variant->id}",
+            ['inventory_policy' => InventoryPolicy::Tracked->value],
+        )->assertUnprocessable()->assertJsonValidationErrors(['inventory_policy']);
+
+        $this->assertSame(InventoryPolicy::Unlimited, $variant->fresh()->inventory_policy);
+    }
+
     private function createAttachment(string $path): Attachment
     {
         return Attachment::create([
diff --git a/tests/Feature/Integration/TelepagosWebhookTest.php b/tests/Feature/Integration/TelepagosWebhookTest.php
index 0a2cf34..af75602 100644
--- a/tests/Feature/Integration/TelepagosWebhookTest.php
+++ b/tests/Feature/Integration/TelepagosWebhookTest.php
@@ -2,8 +2,12 @@
 
 namespace Tests\Feature\Integration;
 
+use App\Domains\Attachable\Enums\AttachmentType;
+use App\Domains\Attachable\Models\Attachment;
 use App\Domains\Auth\Models\User;
 use App\Domains\Cart\Models\Cart;
+use App\Domains\Catalog\Enums\InventoryPolicy;
+use App\Domains\Catalog\Models\Category;
 use App\Domains\Catalog\Models\Product;
 use App\Domains\Catalog\Models\ProductVariant;
 use App\Domains\Integration\Models\Integration;
@@ -14,6 +18,7 @@ use App\Domains\Tenant\Models\Tenant;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Illuminate\Support\Facades\Cache;
 use Illuminate\Support\Facades\Http;
+use Illuminate\Support\Str;
 use Tests\TestCase;
 
 class TelepagosWebhookTest extends TestCase
@@ -24,7 +29,7 @@ class TelepagosWebhookTest extends TestCase
     {
         parent::setUp();
 
-        config(['services.integrations.secret' => 'base64:' . base64_encode(random_bytes(32))]);
+        config(['services.integrations.secret' => 'base64:'.base64_encode(random_bytes(32))]);
         Cache::flush();
     }
 
@@ -113,6 +118,13 @@ class TelepagosWebhookTest extends TestCase
             'total' => 50,
         ]);
 
+        $this->assertDatabaseHas('productos_variantes', [
+            'id' => $variant->id,
+            'stock_real' => 9,
+            'stock_reservado' => 2,
+            'cantidad_vendida' => 1,
+        ]);
+
         $this->assertDatabaseMissing('compra_items', [
             'compra_id' => $newerPurchase->id,
         ]);
@@ -122,6 +134,60 @@ class TelepagosWebhookTest extends TestCase
         ]);
     }
 
+    public function test_transfer_webhook_buys_unlimited_inventory_without_reducing_real_stock(): void
+    {
+        $tenant = $this->createTenant('unlimited', 'Unlimited', 'unlimited.com.ar');
+        $this->configureTelepagosIntegration($tenant);
+        $user = User::factory()->create();
+        $variant = $this->createVariantForTenant(
+            'unlimited',
+            0,
+            '50.00',
+            'service',
+            InventoryPolicy::Unlimited,
+        );
+        $purchase = $this->createPendingTransferPurchase(
+            $tenant,
+            $user->id,
+            $variant->id,
+            3,
+            '87654321',
+        );
+
+        Http::fake([
+            'https://api.telepagos.com.ar/v2/auth/token' => Http::response([
+                'status' => 'ok',
+                'token' => 'test-token',
+                'expires_at' => now()->addHour()->toIso8601String(),
+            ]),
+            'https://api.telepagos.com.ar/v2/payment/cashin/7000' => Http::response([
+                'status' => 'ok',
+                'data' => [
+                    'amount' => 150,
+                    'operation_id' => 1,
+                    'transaction_id' => 'tx-unlimited',
+                    'buyer' => ['cuit' => '20876543219'],
+                ],
+            ]),
+        ]);
+
+        $this->postJson('/api/webhooks/telepagos/unlimited', ['id' => '7000'])
+            ->assertOk()
+            ->assertJsonPath('status', 'success');
+
+        $this->assertDatabaseHas('compras', [
+            'id' => $purchase->id,
+            'status' => Purchase::STATUS_PAID,
+        ]);
+        $this->assertDatabaseHas('productos_variantes', [
+            'id' => $variant->id,
+            'inventory_policy' => InventoryPolicy::Unlimited->value,
+            'stock_real' => 0,
+            'stock_reservado' => 0,
+            'cantidad_vendida' => 3,
+        ]);
+    }
+
     private function createPendingTransferPurchase(
         Tenant $tenant,
         int $userId,
@@ -184,8 +250,9 @@ class TelepagosWebhookTest extends TestCase
         int $stock,
         string $price,
         string $slugPrefix = 'shirt',
+        InventoryPolicy $inventoryPolicy = InventoryPolicy::Tracked,
     ): ProductVariant {
-        $category = \App\Domains\Catalog\Models\Category::query()->create([
+        $category = Category::query()->create([
             'tenant_code' => $tenantCode,
             'nombre' => "{$slugPrefix} category {$tenantCode}",
         ]);
@@ -201,6 +268,7 @@ class TelepagosWebhookTest extends TestCase
 
         return ProductVariant::query()->create([
             'producto_id' => $product->id,
+            'inventory_policy' => $inventoryPolicy->value,
             'slug' => "{$slugPrefix}-variant-".ProductVariant::query()->count(),
             'nombre' => ucfirst($slugPrefix).' Variant',
             'stock' => $stock,
@@ -211,21 +279,21 @@ class TelepagosWebhookTest extends TestCase
 
     private function createTenant(string $codigo, string $nombre, string $dominio): Tenant
     {
-        $hdrKey = (string) \Illuminate\Support\Str::uuid();
-        $ftrKey = (string) \Illuminate\Support\Str::uuid();
+        $hdrKey = (string) Str::uuid();
+        $ftrKey = (string) Str::uuid();
 
-        $headerAttachment = \App\Domains\Attachable\Models\Attachment::create([
+        $headerAttachment = Attachment::create([
             'key' => $hdrKey,
-            'path' => 'tenants/' . $hdrKey . '.png',
+            'path' => 'tenants/'.$hdrKey.'.png',
             'filename' => 'logo_header.png',
-            'type' => \App\Domains\Attachable\Enums\AttachmentType::Image,
+            'type' => AttachmentType::Image,
             'mime_type' => 'image/png',
         ]);
-        $footerAttachment = \App\Domains\Attachable\Models\Attachment::create([
+        $footerAttachment = Attachment::create([
             'key' => $ftrKey,
-            'path' => 'tenants/' . $ftrKey . '.png',
+            'path' => 'tenants/'.$ftrKey.'.png',
             'filename' => 'logo_footer.png',
-            'type' => \App\Domains\Attachable\Enums\AttachmentType::Image,
+            'type' => AttachmentType::Image,
             'mime_type' => 'image/png',
         ]);
 
diff --git a/tests/Feature/Purchase/StorePurchaseTest.php b/tests/Feature/Purchase/StorePurchaseTest.php
index f830af0..bd9549a 100644
--- a/tests/Feature/Purchase/StorePurchaseTest.php
+++ b/tests/Feature/Purchase/StorePurchaseTest.php
@@ -2,14 +2,19 @@
 
 namespace Tests\Feature\Purchase;
 
+use App\Domains\Attachable\Enums\AttachmentType;
+use App\Domains\Attachable\Models\Attachment;
 use App\Domains\Auth\Models\User;
 use App\Domains\Cart\Models\Cart;
+use App\Domains\Catalog\Enums\InventoryPolicy;
+use App\Domains\Catalog\Models\Category;
 use App\Domains\Catalog\Models\Product;
 use App\Domains\Catalog\Models\ProductVariant;
 use App\Domains\Purchase\Models\Purchase;
 use App\Domains\Purchase\Services\CheckoutService;
 use App\Domains\Tenant\Models\Tenant;
 use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Str;
 use Tests\TestCase;
 
 class StorePurchaseTest extends TestCase
@@ -22,7 +27,7 @@ class StorePurchaseTest extends TestCase
         $user = User::factory()->create([
             'email' => 'buyer@example.com',
         ]);
-        $category = \App\Domains\Catalog\Models\Category::query()->create([
+        $category = Category::query()->create([
             'tenant_code' => 'sonder',
             'nombre' => 'Test Category',
         ]);
@@ -237,6 +242,13 @@ class StorePurchaseTest extends TestCase
         $checkoutService->confirmPurchase($purchase);
         $purchase->refresh()->markAsPaid();
 
+        $this->assertDatabaseHas('productos_variantes', [
+            'id' => $variant->id,
+            'stock_real' => 8,
+            'stock_reservado' => 0,
+            'cantidad_vendida' => 2,
+        ]);
+
         $this->assertSoftDeleted('carritos', [
             'id' => $purchase->cart_id,
         ]);
@@ -401,18 +413,48 @@ class StorePurchaseTest extends TestCase
             ->assertJsonValidationErrors(['cart_id']);
     }
 
+    public function test_it_confirms_unlimited_inventory_without_reducing_real_stock_and_is_idempotent(): void
+    {
+        $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
+        $user = User::factory()->create();
+        $variant = $this->createVariantForTenant(
+            'sonder',
+            0,
+            '50.00',
+            'unlimited',
+            InventoryPolicy::Unlimited,
+        );
+        $purchase = $this->createCheckoutPurchase($user, 'sonder', $variant, 25);
+        $purchase->update(['payment_method' => 'transfer']);
+
+        $checkoutService = app(CheckoutService::class);
+        $purchase = $checkoutService->completePurchase($purchase);
+        $checkoutService->confirmPurchase($purchase);
+        $checkoutService->confirmPurchase($purchase);
+
+        $this->assertDatabaseHas('productos_variantes', [
+            'id' => $variant->id,
+            'inventory_policy' => InventoryPolicy::Unlimited->value,
+            'stock_real' => 0,
+            'stock_reservado' => 0,
+            'cantidad_vendida' => 25,
+        ]);
+        $this->assertDatabaseCount('compra_items', 1);
+    }
+
     protected function createVariantForTenant(
         string $tenantCode,
         int $stock,
         string $price,
         string $slugPrefix = 'shirt',
+        InventoryPolicy $inventoryPolicy = InventoryPolicy::Tracked,
     ): ProductVariant {
         $tenant = Tenant::query()->where('codigo', $tenantCode)->first();
         if (! $tenant) {
             $this->createTenant($tenantCode, ucfirst($tenantCode), "{$tenantCode}.com");
         }
 
-        $category = \App\Domains\Catalog\Models\Category::query()->create([
+        $category = Category::query()->create([
             'tenant_code' => $tenantCode,
             'nombre' => "{$slugPrefix} category {$tenantCode}",
         ]);
@@ -428,6 +470,7 @@ class StorePurchaseTest extends TestCase
 
         return ProductVariant::query()->create([
             'producto_id' => $product->id,
+            'inventory_policy' => $inventoryPolicy->value,
             'slug' => "{$slugPrefix}-variant-".ProductVariant::query()->count(),
             'nombre' => ucfirst($slugPrefix).' Variant',
             'stock' => $stock,
@@ -462,21 +505,21 @@ class StorePurchaseTest extends TestCase
 
     protected function createTenant(string $codigo, string $nombre, string $dominio): Tenant
     {
-        $hdrKey = (string) \Illuminate\Support\Str::uuid();
-        $ftrKey = (string) \Illuminate\Support\Str::uuid();
+        $hdrKey = (string) Str::uuid();
+        $ftrKey = (string) Str::uuid();
 
-        $headerAttachment = \App\Domains\Attachable\Models\Attachment::create([
+        $headerAttachment = Attachment::create([
             'key' => $hdrKey,
-            'path' => 'tenants/' . $hdrKey . '.png',
+            'path' => 'tenants/'.$hdrKey.'.png',
             'filename' => 'logo_header.png',
-            'type' => \App\Domains\Attachable\Enums\AttachmentType::Image,
+            'type' => AttachmentType::Image,
             'mime_type' => 'image/png',
         ]);
-        $footerAttachment = \App\Domains\Attachable\Models\Attachment::create([
+        $footerAttachment = Attachment::create([
             'key' => $ftrKey,
-            'path' => 'tenants/' . $ftrKey . '.png',
+            'path' => 'tenants/'.$ftrKey.'.png',
             'filename' => 'logo_footer.png',
-            'type' => \App\Domains\Attachable\Enums\AttachmentType::Image,
+            'type' => AttachmentType::Image,
             'mime_type' => 'image/png',
         ]);
 
diff --git a/tests/Unit/Catalog/ProductVariantInventoryTest.php b/tests/Unit/Catalog/ProductVariantInventoryTest.php
new file mode 100644
index 0000000..d2002dc
--- /dev/null
+++ b/tests/Unit/Catalog/ProductVariantInventoryTest.php
@@ -0,0 +1,153 @@
+<?php
+
+namespace Tests\Unit\Catalog;
+
+use App\Domains\Attachable\Enums\AttachmentType;
+use App\Domains\Attachable\Models\Attachment;
+use App\Domains\Catalog\Enums\InventoryPolicy;
+use App\Domains\Catalog\Models\Category;
+use App\Domains\Catalog\Models\Product;
+use App\Domains\Catalog\Models\ProductVariant;
+use App\Domains\Tenant\Models\Tenant;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Str;
+use Tests\TestCase;
+
+class ProductVariantInventoryTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private Product $product;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $headerAttachment = $this->createAttachment('header.png');
+        $footerAttachment = $this->createAttachment('footer.png');
+
+        $tenant = Tenant::query()->create([
+            'codigo' => 'inventory-test',
+            'nombre' => 'Inventory Test',
+            'dominio' => 'inventory.test',
+            'primary_color' => '#111111',
+            'secondary_color' => '#222222',
+            'danger_color' => '#333333',
+            'success_color' => '#28a745',
+            'header_bg_color' => '#444444',
+            'footer_bg_color' => '#444444',
+            'header_logo_id' => $headerAttachment->id,
+            'footer_logo_id' => $footerAttachment->id,
+        ]);
+
+        $category = Category::query()->create([
+            'tenant_code' => $tenant->codigo,
+            'nombre' => 'Inventory',
+        ]);
+
+        $this->product = Product::query()->create([
+            'tenant_codigo' => $tenant->codigo,
+            'categoria_id' => $category->id,
+            'slug' => 'inventory-product',
+            'nombre' => 'Inventory Product',
+            'precio' => 100,
+        ]);
+    }
+
+    public function test_it_defaults_to_tracked_inventory_with_no_sales(): void
+    {
+        $variant = $this->createVariant(5);
+
+        $this->assertSame(InventoryPolicy::Tracked, $variant->inventory_policy);
+        $this->assertSame(5, $variant->availableQuantity());
+        $this->assertSame(0, $variant->cantidad_vendida);
+        $this->assertTrue($variant->isAvailableForSale());
+    }
+
+    public function test_tracked_inventory_cannot_reserve_more_than_available_stock(): void
+    {
+        $variant = $this->createVariant(5);
+        $variant->reserveStock(3);
+
+        $this->assertSame(2, $variant->fresh()->availableQuantity());
+
+        $this->expectException(\InvalidArgumentException::class);
+        $variant->reserveStock(3);
+    }
+
+    public function test_unlimited_inventory_can_reserve_more_than_real_stock(): void
+    {
+        $variant = $this->createVariant(0, InventoryPolicy::Unlimited);
+        $variant->reserveStock(50);
+
+        $variant->refresh();
+        $this->assertNull($variant->availableQuantity());
+        $this->assertSame(50, $variant->stock_reservado);
+        $this->assertTrue($variant->isAvailableForSale());
+    }
+
+    public function test_buying_tracked_inventory_consumes_stock_and_records_the_sale(): void
+    {
+        $variant = $this->createVariant(10);
+        $variant->reserveStock(4);
+        $variant->buy(3);
+
+        $variant->refresh();
+        $this->assertSame(7, $variant->stock_real);
+        $this->assertSame(1, $variant->stock_reservado);
+        $this->assertSame(3, $variant->cantidad_vendida);
+    }
+
+    public function test_buying_unlimited_inventory_preserves_real_stock_and_records_the_sale(): void
+    {
+        $variant = $this->createVariant(0, InventoryPolicy::Unlimited);
+        $variant->reserveStock(4);
+        $variant->buy(3);
+
+        $variant->refresh();
+        $this->assertSame(0, $variant->stock_real);
+        $this->assertSame(1, $variant->stock_reservado);
+        $this->assertSame(3, $variant->cantidad_vendida);
+    }
+
+    public function test_buy_requires_enough_reserved_stock(): void
+    {
+        $variant = $this->createVariant(10);
+        $variant->reserveStock(1);
+
+        $this->expectException(\InvalidArgumentException::class);
+        $variant->buy(2);
+    }
+
+    public function test_inventory_policy_cannot_change_after_creation(): void
+    {
+        $variant = $this->createVariant(10);
+        $variant->inventory_policy = InventoryPolicy::Unlimited;
+
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('La politica de inventario no puede modificarse.');
+        $variant->save();
+    }
+
+    private function createVariant(
+        int $stock,
+        InventoryPolicy $inventoryPolicy = InventoryPolicy::Tracked,
+    ): ProductVariant {
+        return ProductVariant::query()->create([
+            'producto_id' => $this->product->id,
+            'stock' => $stock,
+            'inventory_policy' => $inventoryPolicy->value,
+        ]);
+    }
+
+    private function createAttachment(string $filename): Attachment
+    {
+        return Attachment::query()->create([
+            'key' => (string) Str::uuid(),
+            'path' => 'tests/'.$filename,
+            'filename' => $filename,
+            'type' => AttachmentType::Image,
+            'mime_type' => 'image/png',
+        ]);
+    }
+}