diff --git a/doc/swagger.yml b/doc/swagger.yml
index 9f82f59cb..3c17b7a76 100644
--- a/doc/swagger.yml
+++ b/doc/swagger.yml
@@ -876,7 +876,6 @@ definitions:
         description: "Body of request used to put item to the cart."
         required:
         - "productCode"
-        - "quantity"
         properties:
             productCode:
                 type: "string"
@@ -885,6 +884,7 @@ definitions:
                 type: "integer"
                 minimum: 1
                 example: 3
+                default: 1
             variantCode:
                 type: "string"
                 example: "SMALL_LOGAN_T_SHIRT_CODE"
diff --git a/src/Request/ChangeItemQuantityRequest.php b/src/Request/ChangeItemQuantityRequest.php
index c99f67de5..fed35b221 100644
--- a/src/Request/ChangeItemQuantityRequest.php
+++ b/src/Request/ChangeItemQuantityRequest.php
@@ -31,7 +31,7 @@ public function __construct(Request $request)
     {
         $this->token = $request->attributes->get('token');
         $this->id = $request->attributes->get('id');
-        $this->quantity = $request->request->get('quantity');
+        $this->quantity = $request->request->getInt('quantity');
     }
 
     /**
diff --git a/src/Request/PutOptionBasedConfigurableItemToCartRequest.php b/src/Request/PutOptionBasedConfigurableItemToCartRequest.php
index 490ea392a..82089974f 100644
--- a/src/Request/PutOptionBasedConfigurableItemToCartRequest.php
+++ b/src/Request/PutOptionBasedConfigurableItemToCartRequest.php
@@ -44,7 +44,7 @@ public static function fromArray(array $item)
 
     public static function fromRequest(Request $request)
     {
-        return new self($request->attributes->get('token'), $request->request->get('productCode'), $request->request->get('options'), $request->request->get('quantity'));
+        return new self($request->attributes->get('token'), $request->request->get('productCode'), $request->request->get('options'), $request->request->getInt('quantity', 1));
     }
 
     /**
diff --git a/src/Request/PutSimpleItemToCartRequest.php b/src/Request/PutSimpleItemToCartRequest.php
index 817729620..0e824823b 100644
--- a/src/Request/PutSimpleItemToCartRequest.php
+++ b/src/Request/PutSimpleItemToCartRequest.php
@@ -38,7 +38,7 @@ public static function fromArray(array $item)
 
     public static function fromRequest(Request $request)
     {
-        return new self($request->attributes->get('token'), $request->request->get('productCode'), $request->request->get('quantity'));
+        return new self($request->attributes->get('token'), $request->request->get('productCode'), $request->request->getInt('quantity', 1));
     }
 
     /**
diff --git a/src/Request/PutVariantBasedConfigurableItemToCartRequest.php b/src/Request/PutVariantBasedConfigurableItemToCartRequest.php
index 25d087404..1564abbe0 100644
--- a/src/Request/PutVariantBasedConfigurableItemToCartRequest.php
+++ b/src/Request/PutVariantBasedConfigurableItemToCartRequest.php
@@ -44,7 +44,7 @@ public static function fromArray(array $item)
 
     public static function fromRequest(Request $request)
     {
-        return new self($request->attributes->get('token'), $request->request->get('productCode'), $request->request->get('variantCode'), $request->request->get('quantity'));
+        return new self($request->attributes->get('token'), $request->request->get('productCode'), $request->request->get('variantCode'), $request->request->getInt('quantity', 1));
     }
 
     /**
diff --git a/tests/Controller/CartChangeItemQuantityApiTest.php b/tests/Controller/CartChangeItemQuantityApiTest.php
index 7a3ae87b8..0190e4bef 100644
--- a/tests/Controller/CartChangeItemQuantityApiTest.php
+++ b/tests/Controller/CartChangeItemQuantityApiTest.php
@@ -102,7 +102,7 @@ public function it_does_not_allow_to_change_quantity_without_quantity_defined()
         $this->client->request('PUT', '/shop-api/carts/SDAOSLEFNWU35H3QLI5325/items/1', [], [], static::$acceptAndContentTypeHeader);
         $response = $this->client->getResponse();
 
-        $this->assertResponse($response, 'cart/validation_quantity_not_defined_response', Response::HTTP_BAD_REQUEST);
+        $this->assertResponse($response, 'cart/validation_quantity_lower_than_one_response', Response::HTTP_BAD_REQUEST);
     }
 
     /**
diff --git a/tests/Controller/CartPutItemToCartApiTest.php b/tests/Controller/CartPutItemToCartApiTest.php
index d1cc782eb..da10633e7 100644
--- a/tests/Controller/CartPutItemToCartApiTest.php
+++ b/tests/Controller/CartPutItemToCartApiTest.php
@@ -99,31 +99,6 @@ public function it_validates_if_product_is_simple_during_add_simple_product()
         $this->assertResponse($response, 'cart/validation_product_not_simple_response', Response::HTTP_BAD_REQUEST);
     }
 
-    /**
-     * @test
-     */
-    public function it_validates_if_request_has_quantity_during_add_simple_product()
-    {
-        $this->loadFixturesFromFile('shop.yml');
-
-        $token = 'SDAOSLEFNWU35H3QLI5325';
-
-        /** @var CommandBus $bus */
-        $bus = $this->get('tactician.commandbus');
-        $bus->handle(new PickupCart($token, 'WEB_GB'));
-
-        $data =
-<<<EOT
-        {
-            "productCode": "LOGAN_MUG_CODE"
-        }
-EOT;
-        $this->client->request('POST', sprintf('/shop-api/carts/%s/items', $token), [], [], static::$acceptAndContentTypeHeader, $data);
-        $response = $this->client->getResponse();
-
-        $this->assertResponse($response, 'cart/validation_quantity_not_defined_response', Response::HTTP_BAD_REQUEST);
-    }
-
     /**
      * @test
      */
@@ -153,7 +128,7 @@ public function it_validates_if_quantity_is_larger_than_0_during_add_simple_prod
     /**
      * @test
      */
-    public function it_validates_if_quantity_is_is_an_integer_during_add_simple_product()
+    public function it_converts_quantity_as_an_integer_and_adds_simple_product()
     {
         $this->loadFixturesFromFile('shop.yml');
 
@@ -173,7 +148,7 @@ public function it_validates_if_quantity_is_is_an_integer_during_add_simple_prod
         $this->client->request('POST', sprintf('/shop-api/carts/%s/items', $token), [], [], static::$acceptAndContentTypeHeader, $data);
         $response = $this->client->getResponse();
 
-        $this->assertResponse($response, 'cart/validation_quantity_not_integer_response', Response::HTTP_BAD_REQUEST);
+        $this->assertResponse($response, 'cart/add_simple_product_to_cart_response', Response::HTTP_CREATED);
     }
 
     /**
@@ -361,32 +336,6 @@ public function it_increases_quantity_of_existing_item_if_the_same_variant_is_ad
         $this->assertResponse($response, 'cart/add_product_variant_multiple_times_to_cart_response', Response::HTTP_CREATED);
     }
 
-    /**
-     * @test
-     */
-    public function it_validates_if_request_has_quantity_during_add_variant_based_configurable_product()
-    {
-        $this->loadFixturesFromFile('shop.yml');
-
-        $token = 'SDAOSLEFNWU35H3QLI5325';
-
-        /** @var CommandBus $bus */
-        $bus = $this->get('tactician.commandbus');
-        $bus->handle(new PickupCart($token, 'WEB_GB'));
-
-        $data =
-<<<EOT
-        {
-            "productCode": "LOGAN_T_SHIRT_CODE",
-            "variantCode": "SMALL_LOGAN_T_SHIRT_CODE"
-        }
-EOT;
-        $this->client->request('POST', sprintf('/shop-api/carts/%s/items', $token), [], [], static::$acceptAndContentTypeHeader, $data);
-        $response = $this->client->getResponse();
-
-        $this->assertResponse($response, 'cart/validation_quantity_not_defined_response', Response::HTTP_BAD_REQUEST);
-    }
-
     /**
      * @test
      */
@@ -417,7 +366,7 @@ public function it_validates_if_quantity_is_larger_than_0_during_add_variant_bas
     /**
      * @test
      */
-    public function it_validates_if_quantity_is_is_an_integer_during_add_variant_based_configurable_product()
+    public function it_converts_quantity_as_an_integer_and_adds_variant_based_configurable_product()
     {
         $this->loadFixturesFromFile('shop.yml');
 
@@ -438,7 +387,7 @@ public function it_validates_if_quantity_is_is_an_integer_during_add_variant_bas
         $this->client->request('POST', sprintf('/shop-api/carts/%s/items', $token), [], [], static::$acceptAndContentTypeHeader, $data);
         $response = $this->client->getResponse();
 
-        $this->assertResponse($response, 'cart/validation_quantity_not_integer_response', Response::HTTP_BAD_REQUEST);
+        $this->assertResponse($response, 'cart/add_product_variant_to_cart_response', Response::HTTP_CREATED);
     }
 
     /**
diff --git a/tests/Responses/Expected/cart/validation_quantity_not_defined_response.json b/tests/Responses/Expected/cart/validation_quantity_not_defined_response.json
deleted file mode 100644
index 2f4d2a462..000000000
--- a/tests/Responses/Expected/cart/validation_quantity_not_defined_response.json
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-    "code": 400,
-    "message": "Validation failed",
-    "errors": {
-        "quantity": [
-            "sylius.shop_api.quantity.not_null"
-        ]
-    }
-}
diff --git a/tests/Responses/Expected/cart/validation_quantity_not_integer_response.json b/tests/Responses/Expected/cart/validation_quantity_not_integer_response.json
deleted file mode 100644
index c2a66cdf9..000000000
--- a/tests/Responses/Expected/cart/validation_quantity_not_integer_response.json
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-    "code": 400,
-    "message": "Validation failed",
-    "errors": {
-        "quantity": [
-            "sylius.shop_api.quantity.type_integer"
-        ]
-    }
-}