diff --git a/app/code/Magento/QuoteGraphQl/Model/Cart/AddSimpleProductToCart.php b/app/code/Magento/QuoteGraphQl/Model/Cart/AddSimpleProductToCart.php
index 6868ce3f7f1f..ad730288e5cc 100644
--- a/app/code/Magento/QuoteGraphQl/Model/Cart/AddSimpleProductToCart.php
+++ b/app/code/Magento/QuoteGraphQl/Model/Cart/AddSimpleProductToCart.php
@@ -66,8 +66,8 @@ public function __construct(
     public function execute(Quote $cart, array $cartItemData): void
     {
         $sku = $this->extractSku($cartItemData);
-        $qty = $this->extractQty($cartItemData);
-        if ($qty <= 0) {
+        $quantity = $this->extractQuantity($cartItemData);
+        if ($quantity <= 0) {
             throw new GraphQlInputException(
                 __('Please enter a number greater than 0 in this field.')
             );
@@ -81,7 +81,7 @@ public function execute(Quote $cart, array $cartItemData): void
         }
 
         try {
-            $result = $cart->addProduct($product, $this->createBuyRequest($qty, $customizableOptions));
+            $result = $cart->addProduct($product, $this->createBuyRequest($quantity, $customizableOptions));
         } catch (\Exception $e) {
             throw new GraphQlInputException(
                 __(
@@ -113,19 +113,19 @@ private function extractSku(array $cartItemData): string
     }
 
     /**
-     * Extract Qty from cart item data
+     * Extract quantity from cart item data
      *
      * @param array $cartItemData
      * @return float
      * @throws GraphQlInputException
      */
-    private function extractQty(array $cartItemData): float
+    private function extractQuantity(array $cartItemData): float
     {
-        $qty = $this->arrayManager->get('data/qty', $cartItemData);
-        if (!isset($qty)) {
-            throw new GraphQlInputException(__('Missing key "qty" in cart item data'));
+        $quantity = $this->arrayManager->get('data/quantity', $cartItemData);
+        if (!isset($quantity)) {
+            throw new GraphQlInputException(__('Missing key "quantity" in cart item data'));
         }
-        return (float)$qty;
+        return (float)$quantity;
     }
 
     /**
@@ -148,15 +148,15 @@ private function extractCustomizableOptions(array $cartItemData): array
     /**
      * Format GraphQl input data to a shape that buy request has
      *
-     * @param float $qty
+     * @param float $quantity
      * @param array $customOptions
      * @return DataObject
      */
-    private function createBuyRequest(float $qty, array $customOptions): DataObject
+    private function createBuyRequest(float $quantity, array $customOptions): DataObject
     {
         return $this->dataObjectFactory->create([
             'data' => [
-                'qty' => $qty,
+                'qty' => $quantity,
                 'options' => $customOptions,
             ],
         ]);
diff --git a/app/code/Magento/QuoteGraphQl/Model/Resolver/CartItems.php b/app/code/Magento/QuoteGraphQl/Model/Resolver/CartItems.php
index da6619d15a48..f259dcd4a78f 100644
--- a/app/code/Magento/QuoteGraphQl/Model/Resolver/CartItems.php
+++ b/app/code/Magento/QuoteGraphQl/Model/Resolver/CartItems.php
@@ -38,7 +38,7 @@ public function resolve(Field $field, $context, ResolveInfo $info, array $value
 
             $itemsData[] = [
                 'id' => $cartItem->getItemId(),
-                'qty' => $cartItem->getQty(),
+                'quantity' => $cartItem->getQty(),
                 'product' => $productData,
                 'model' => $cartItem,
             ];
diff --git a/app/code/Magento/QuoteGraphQl/Model/Resolver/UpdateCartItems.php b/app/code/Magento/QuoteGraphQl/Model/Resolver/UpdateCartItems.php
index 25a79ae126ef..b76c9159d859 100644
--- a/app/code/Magento/QuoteGraphQl/Model/Resolver/UpdateCartItems.php
+++ b/app/code/Magento/QuoteGraphQl/Model/Resolver/UpdateCartItems.php
@@ -99,7 +99,7 @@ private function processCartItems(Quote $cart, array $items): void
             if (!isset($item['quantity'])) {
                 throw new GraphQlInputException(__('Required parameter "quantity" for "cart_items" is missing.'));
             }
-            $qty = (float)$item['quantity'];
+            $quantity = (float)$item['quantity'];
 
             $cartItem = $cart->getItemById($itemId);
             if ($cartItem === false) {
@@ -108,10 +108,10 @@ private function processCartItems(Quote $cart, array $items): void
                 );
             }
 
-            if ($qty <= 0.0) {
+            if ($quantity <= 0.0) {
                 $this->cartItemRepository->deleteById((int)$cart->getId(), $itemId);
             } else {
-                $cartItem->setQty($qty);
+                $cartItem->setQty($quantity);
                 $this->validateCartItem($cartItem);
                 $this->cartItemRepository->save($cartItem);
             }
diff --git a/app/code/Magento/QuoteGraphQl/etc/schema.graphqls b/app/code/Magento/QuoteGraphQl/etc/schema.graphqls
index 6d94685ac4d0..fcd2471cd400 100644
--- a/app/code/Magento/QuoteGraphQl/etc/schema.graphqls
+++ b/app/code/Magento/QuoteGraphQl/etc/schema.graphqls
@@ -47,7 +47,7 @@ input VirtualProductCartItemInput {
 
 input CartItemInput {
     sku: String!
-    qty: Float!
+    quantity: Float!
 }
 
 input CustomizableOptionInput {
@@ -62,10 +62,10 @@ input ApplyCouponToCartInput {
 
 input UpdateCartItemsInput {
     cart_id: String!
-    cart_items: [CartItemQuantityInput!]!
+    cart_items: [CartItemUpdateInput!]!
 }
 
-input CartItemQuantityInput {
+input CartItemUpdateInput {
     cart_item_id: Int!
     quantity: Float!
 }
@@ -304,7 +304,7 @@ type VirtualCartItem implements CartItemInterface @doc(description: "Virtual Car
 
 interface CartItemInterface @typeResolver(class: "Magento\\QuoteGraphQl\\Model\\Resolver\\CartItemTypeResolver") {
     id: String!
-    qty: Float!
+    quantity: Float!
     product: ProductInterface!
 }
 
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/CatalogInventory/AddProductToCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/CatalogInventory/AddProductToCartTest.php
index a97d30fef803..1633c83895e6 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/CatalogInventory/AddProductToCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/CatalogInventory/AddProductToCartTest.php
@@ -39,10 +39,10 @@ protected function setUp()
     public function testAddProductIfQuantityIsNotAvailable()
     {
         $sku = 'simple';
-        $qty = 200;
+        $quantity = 200;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_order_1');
 
-        $query = $this->getQuery($maskedQuoteId, $sku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
         $this->graphQlMutation($query);
     }
 
@@ -58,10 +58,10 @@ public function testAddMoreProductsThatAllowed()
         $this->markTestIncomplete('https://github.com/magento/graphql-ce/issues/167');
 
         $sku = 'custom-design-simple-product';
-        $qty = 7;
+        $quantity = 7;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_order_1');
 
-        $query = $this->getQuery($maskedQuoteId, $sku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
         $this->graphQlMutation($query);
     }
 
@@ -115,7 +115,7 @@ private function getQuery(string $maskedQuoteId, string $sku, float $qty) : stri
       cartItems: [
         {
           data: {
-            qty: $qty
+            quantity: $qty
             sku: "$sku"
           }
         }
@@ -124,7 +124,7 @@ private function getQuery(string $maskedQuoteId, string $sku, float $qty) : stri
   ) {
     cart {
       items {
-        qty
+        quantity
       }
     }
   }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/ConfigurableProduct/AddConfigurableProductToCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/ConfigurableProduct/AddConfigurableProductToCartTest.php
index d22cd14a4ae2..6810f9d44ce9 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/ConfigurableProduct/AddConfigurableProductToCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/ConfigurableProduct/AddConfigurableProductToCartTest.php
@@ -37,14 +37,14 @@ protected function setUp()
     public function testAddConfigurableProductToCart()
     {
         $variantSku = 'simple_41';
-        $qty = 2;
+        $quantity = 2;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_order_1');
 
-        $query = $this->getQuery($maskedQuoteId, $variantSku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $variantSku, $quantity);
         $response = $this->graphQlMutation($query);
 
         $cartItems = $response['addConfigurableProductsToCart']['cart']['items'];
-        self::assertEquals($qty, $cartItems[0]['qty']);
+        self::assertEquals($quantity, $cartItems[0]['quantity']);
         self::assertEquals($variantSku, $cartItems[0]['product']['sku']);
     }
 
@@ -57,10 +57,10 @@ public function testAddConfigurableProductToCart()
     public function testAddProductIfQuantityIsNotAvailable()
     {
         $variantSku = 'simple_41';
-        $qty = 200;
+        $quantity = 200;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_order_1');
 
-        $query = $this->getQuery($maskedQuoteId, $variantSku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $variantSku, $quantity);
         $this->graphQlMutation($query);
     }
 
@@ -73,20 +73,20 @@ public function testAddProductIfQuantityIsNotAvailable()
     public function testAddOutOfStockProduct()
     {
         $variantSku = 'simple_1010';
-        $qty = 1;
+        $quantity = 1;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_order_1');
 
-        $query = $this->getQuery($maskedQuoteId, $variantSku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $variantSku, $quantity);
         $this->graphQlMutation($query);
     }
 
     /**
      * @param string $maskedQuoteId
      * @param string $variantSku
-     * @param int $qty
+     * @param int $quantity
      * @return string
      */
-    private function getQuery(string $maskedQuoteId, string $variantSku, int $qty): string
+    private function getQuery(string $maskedQuoteId, string $variantSku, int $quantity): string
     {
         return <<<QUERY
 mutation {
@@ -97,7 +97,7 @@ private function getQuery(string $maskedQuoteId, string $variantSku, int $qty):
         {
           variant_sku: "{$variantSku}"
           data: {
-            qty: {$qty}
+            quantity: {$quantity}
             sku: "{$variantSku}"
           }
         }
@@ -107,7 +107,7 @@ private function getQuery(string $maskedQuoteId, string $variantSku, int $qty):
     cart {
       items {
         id
-        qty
+        quantity
         product {
           name
           sku
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/AddSimpleProductWithCustomOptionsToCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/AddSimpleProductWithCustomOptionsToCartTest.php
index f33ccce82fcb..63546298304b 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/AddSimpleProductWithCustomOptionsToCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/AddSimpleProductWithCustomOptionsToCartTest.php
@@ -46,7 +46,7 @@ protected function setUp()
     public function testAddSimpleProductWithOptions()
     {
         $sku = 'simple';
-        $qty = 1;
+        $quantity = 1;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_order_1');
 
         $customOptionsValues = $this->getCustomOptionsValuesForQuery($sku);
@@ -62,7 +62,7 @@ public function testAddSimpleProductWithOptions()
       cartItems: [
         {
           data: {
-            qty: $qty
+            quantity: $quantity
             sku: "$sku"
           },
           customizable_options: $queryCustomizableOptions  
@@ -110,7 +110,7 @@ public function testAddSimpleProductWithOptions()
     public function testAddSimpleProductWithNoRequiredOptionsSet()
     {
         $sku = 'simple';
-        $qty = 1;
+        $quantity = 1;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_order_1');
 
         $query = <<<QUERY
@@ -121,7 +121,7 @@ public function testAddSimpleProductWithNoRequiredOptionsSet()
       cartItems: [
         {
           data: {
-            qty: $qty
+            quantity: $quantity
             sku: "$sku"
           }
         }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/AddVirtualProductWithCustomOptionsToCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/AddVirtualProductWithCustomOptionsToCartTest.php
index ffd52bcf7fb1..94ac11ad8e0b 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/AddVirtualProductWithCustomOptionsToCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/AddVirtualProductWithCustomOptionsToCartTest.php
@@ -46,7 +46,7 @@ protected function setUp()
     public function testAddVirtualProductWithOptions()
     {
         $sku = 'virtual';
-        $qty = 1;
+        $quantity = 1;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_order_1');
 
         $customOptionsValues = $this->getCustomOptionsValuesForQuery($sku);
@@ -62,7 +62,7 @@ public function testAddVirtualProductWithOptions()
       cartItems: [
         {
           data: {
-            qty: $qty
+            quantity: $quantity
             sku: "$sku"
           },
           customizable_options: $queryCustomizableOptions  
@@ -110,7 +110,7 @@ public function testAddVirtualProductWithOptions()
     public function testAddVirtualProductWithNoRequiredOptionsSet()
     {
         $sku = 'virtual';
-        $qty = 1;
+        $quantity = 1;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_order_1');
 
         $query = <<<QUERY
@@ -121,7 +121,7 @@ public function testAddVirtualProductWithNoRequiredOptionsSet()
       cartItems: [
         {
           data: {
-            qty: $qty
+            quantity: $quantity
             sku: "$sku"
           }
         }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddSimpleProductToCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddSimpleProductToCartTest.php
index 73b3e3972186..be22d860df12 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddSimpleProductToCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddSimpleProductToCartTest.php
@@ -43,13 +43,13 @@ protected function setUp()
     public function testAddSimpleProductToCart()
     {
         $sku = 'simple_product';
-        $qty = 2;
+        $quantity = 2;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
-        $query = $this->getQuery($maskedQuoteId, $sku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
         $response = $this->graphQlMutation($query, [], '', $this->getHeaderMap());
 
         self::assertArrayHasKey('cart', $response['addSimpleProductsToCart']);
-        self::assertEquals($qty, $response['addSimpleProductsToCart']['cart']['items'][0]['qty']);
+        self::assertEquals($quantity, $response['addSimpleProductsToCart']['cart']['items'][0]['quantity']);
         self::assertEquals($sku, $response['addSimpleProductsToCart']['cart']['items'][0]['product']['sku']);
     }
 
@@ -63,10 +63,10 @@ public function testAddSimpleProductToCart()
     public function testAddProductToNonExistentCart()
     {
         $sku = 'simple_product';
-        $qty = 2;
+        $quantity = 2;
         $maskedQuoteId = 'non_existent_masked_id';
 
-        $query = $this->getQuery($maskedQuoteId, $sku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
         $this->graphQlMutation($query, [], '', $this->getHeaderMap());
     }
 
@@ -130,10 +130,10 @@ public function testAddSimpleProductToAnotherCustomerCart()
     /**
      * @param string $maskedQuoteId
      * @param string $sku
-     * @param int $qty
+     * @param float $quantity
      * @return string
      */
-    private function getQuery(string $maskedQuoteId, string $sku, int $qty): string
+    private function getQuery(string $maskedQuoteId, string $sku, float $quantity): string
     {
         return <<<QUERY
 mutation {
@@ -142,7 +142,7 @@ private function getQuery(string $maskedQuoteId, string $sku, int $qty): string
     cartItems: [
       {
         data: {
-          qty: {$qty}
+          quantity: {$quantity}
           sku: "{$sku}"
         }
       }                
@@ -151,7 +151,7 @@ private function getQuery(string $maskedQuoteId, string $sku, int $qty): string
     cart {
       items {
         id
-        qty
+        quantity
         product {
           sku
         }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddVirtualProductToCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddVirtualProductToCartTest.php
index 4ec25bb03007..1269b9d8e7b3 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddVirtualProductToCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddVirtualProductToCartTest.php
@@ -43,13 +43,13 @@ protected function setUp()
     public function testAddVirtualProductToCart()
     {
         $sku = 'virtual_product';
-        $qty = 2;
+        $quantity = 2;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
-        $query = $this->getQuery($maskedQuoteId, $sku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
         $response = $this->graphQlMutation($query, [], '', $this->getHeaderMap());
 
         self::assertArrayHasKey('cart', $response['addVirtualProductsToCart']);
-        self::assertEquals($qty, $response['addVirtualProductsToCart']['cart']['items'][0]['qty']);
+        self::assertEquals($quantity, $response['addVirtualProductsToCart']['cart']['items'][0]['quantity']);
         self::assertEquals($sku, $response['addVirtualProductsToCart']['cart']['items'][0]['product']['sku']);
     }
 
@@ -130,10 +130,10 @@ public function testAddVirtualProductToAnotherCustomerCart()
     /**
      * @param string $maskedQuoteId
      * @param string $sku
-     * @param int $qty
+     * @param float $quantity
      * @return string
      */
-    private function getQuery(string $maskedQuoteId, string $sku, int $qty): string
+    private function getQuery(string $maskedQuoteId, string $sku, float $quantity): string
     {
         return <<<QUERY
 mutation {
@@ -142,7 +142,7 @@ private function getQuery(string $maskedQuoteId, string $sku, int $qty): string
     cartItems: [
       {
         data: {
-          qty: {$qty}
+          quantity: {$quantity}
           sku: "{$sku}"
         }
       }                
@@ -151,7 +151,7 @@ private function getQuery(string $maskedQuoteId, string $sku, int $qty): string
     cart {
       items {
         id
-        qty
+        quantity
         product {
           sku
         }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/CheckoutEndToEndTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/CheckoutEndToEndTest.php
index a49b84e20a8a..d82cee56d9bf 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/CheckoutEndToEndTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/CheckoutEndToEndTest.php
@@ -81,7 +81,7 @@ protected function setUp()
      */
     public function testCheckoutWorkflow()
     {
-        $qty = 2;
+        $quantity = 2;
 
         $this->createCustomer();
         $token = $this->loginCustomer();
@@ -89,7 +89,7 @@ public function testCheckoutWorkflow()
 
         $sku = $this->findProduct();
         $cartId = $this->createEmptyCart();
-        $this->addProductToCart($cartId, $qty, $sku);
+        $this->addProductToCart($cartId, $quantity, $sku);
 
         $this->setBillingAddress($cartId);
         $shippingMethod = $this->setShippingAddress($cartId);
@@ -215,7 +215,7 @@ private function addProductToCart(string $cartId, float $qty, string $sku): void
       cartItems: [
         {
           data: {
-            qty: {$qty}
+            quantity: {$qty}
             sku: "{$sku}"
           }
         }
@@ -224,7 +224,7 @@ private function addProductToCart(string $cartId, float $qty, string $sku): void
   ) {
     cart {
       items {
-        qty
+        quantity
         product {
           sku
         }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/GetCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/GetCartTest.php
index 60790aacb37b..99e1c0bbd157 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/GetCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/GetCartTest.php
@@ -54,11 +54,11 @@ public function testGetCart()
         self::assertCount(2, $response['cart']['items']);
 
         self::assertNotEmpty($response['cart']['items'][0]['id']);
-        self::assertEquals(2, $response['cart']['items'][0]['qty']);
+        self::assertEquals(2, $response['cart']['items'][0]['quantity']);
         self::assertEquals('simple_product', $response['cart']['items'][0]['product']['sku']);
 
         self::assertNotEmpty($response['cart']['items'][1]['id']);
-        self::assertEquals(2, $response['cart']['items'][1]['qty']);
+        self::assertEquals(2, $response['cart']['items'][1]['quantity']);
         self::assertEquals('virtual-product', $response['cart']['items'][1]['product']['sku']);
     }
 
@@ -187,7 +187,7 @@ private function getQuery(string $maskedQuoteId): string
   cart(cart_id: "{$maskedQuoteId}") {
     items {
       id
-      qty
+      quantity
       product {
         sku
       }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/RemoveItemFromCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/RemoveItemFromCartTest.php
index 39803f8d5844..5f953d43355f 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/RemoveItemFromCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/RemoveItemFromCartTest.php
@@ -107,7 +107,7 @@ public function testUpdateWithMissedItemRequiredParameters(string $input, string
   ) {
     cart {
       items {
-        qty
+        quantity
       }
     }
   }
@@ -216,7 +216,7 @@ private function getQuery(string $maskedQuoteId, int $itemId): string
   ) {
     cart {
       items {
-        qty
+        quantity
       }
     }
   }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetPaymentMethodOnCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetPaymentMethodOnCartTest.php
index 2604ec5f0a0f..593bb8c9fcb7 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetPaymentMethodOnCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetPaymentMethodOnCartTest.php
@@ -196,7 +196,7 @@ public function testSetPaymentMethodWithoutRequiredParameters(string $input, str
   ) {
     cart {
       items {
-        qty
+        quantity
       }
     }
   }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/UpdateCartItemsTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/UpdateCartItemsTest.php
index 35e2d62214fb..bc88bd1ddb43 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/UpdateCartItemsTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/UpdateCartItemsTest.php
@@ -58,15 +58,15 @@ protected function setUp()
     /**
      * @magentoApiDataFixture Magento/Checkout/_files/quote_with_address_saved.php
      */
-    public function testUpdateCartItemQty()
+    public function testUpdateCartItemQuantity()
     {
         $quote = $this->quoteFactory->create();
         $this->quoteResource->load($quote, 'test_order_1', 'reserved_order_id');
         $maskedQuoteId = $this->quoteIdToMaskedId->execute((int)$quote->getId());
         $itemId = (int)$quote->getItemByProduct($this->productRepository->get('simple'))->getId();
-        $qty = 2;
+        $quantity = 2;
 
-        $query = $this->getQuery($maskedQuoteId, $itemId, $qty);
+        $query = $this->getQuery($maskedQuoteId, $itemId, $quantity);
         $response = $this->graphQlMutation($query, [], '', $this->getHeaderMap());
 
         $this->assertArrayHasKey('updateCartItems', $response);
@@ -76,7 +76,7 @@ public function testUpdateCartItemQty()
         $item = current($responseCart['items']);
 
         $this->assertEquals($itemId, $item['id']);
-        $this->assertEquals($qty, $item['qty']);
+        $this->assertEquals($quantity, $item['quantity']);
     }
 
     /**
@@ -88,9 +88,9 @@ public function testRemoveCartItemIfQuantityIsZero()
         $this->quoteResource->load($quote, 'test_order_1', 'reserved_order_id');
         $maskedQuoteId = $this->quoteIdToMaskedId->execute((int)$quote->getId());
         $itemId = (int)$quote->getItemByProduct($this->productRepository->get('simple'))->getId();
-        $qty = 0;
+        $quantity = 0;
 
-        $query = $this->getQuery($maskedQuoteId, $itemId, $qty);
+        $query = $this->getQuery($maskedQuoteId, $itemId, $quantity);
         $response = $this->graphQlMutation($query, [], '', $this->getHeaderMap());
 
         $this->assertArrayHasKey('updateCartItems', $response);
@@ -229,7 +229,7 @@ public function testUpdateWithMissedCartItemId()
     cart {
       items {
         id
-        qty
+        quantity
       }
     }
   }
@@ -259,7 +259,7 @@ public function testUpdateWithMissedItemRequiredParameters(string $input, string
     cart {
       items {
         id
-        qty
+        quantity
       }
     }
   }
@@ -285,7 +285,7 @@ public function dataProviderUpdateWithMissedRequiredParameters(): array
             ],
             'missed_cart_item_qty' => [
                 'cart_items: [{ cart_item_id: 1 }]',
-                'Required parameter "quantity" for "cart_items" is missing.'
+                'Field CartItemUpdateInput.quantity of required type Float! was not provided.'
             ],
         ];
     }
@@ -293,10 +293,10 @@ public function dataProviderUpdateWithMissedRequiredParameters(): array
     /**
      * @param string $maskedQuoteId
      * @param int $itemId
-     * @param float $qty
+     * @param float $quantity
      * @return string
      */
-    private function getQuery(string $maskedQuoteId, int $itemId, float $qty): string
+    private function getQuery(string $maskedQuoteId, int $itemId, float $quantity): string
     {
         return <<<QUERY
 mutation {
@@ -305,14 +305,14 @@ private function getQuery(string $maskedQuoteId, int $itemId, float $qty): strin
     cart_items:[
       {
         cart_item_id: {$itemId}
-        quantity: {$qty}
+        quantity: {$quantity}
       }
     ]
   }) {
     cart {
       items {
         id
-        qty
+        quantity
       }
     }
   }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddSimpleProductToCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddSimpleProductToCartTest.php
index 9e0693b16085..8b20320fc2f0 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddSimpleProductToCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddSimpleProductToCartTest.php
@@ -37,14 +37,14 @@ protected function setUp()
     public function testAddSimpleProductToCart()
     {
         $sku = 'simple_product';
-        $qty = 2;
+        $quantity = 2;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
 
-        $query = $this->getQuery($maskedQuoteId, $sku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
         $response = $this->graphQlMutation($query);
         self::assertArrayHasKey('cart', $response['addSimpleProductsToCart']);
 
-        self::assertEquals($qty, $response['addSimpleProductsToCart']['cart']['items'][0]['qty']);
+        self::assertEquals($quantity, $response['addSimpleProductsToCart']['cart']['items'][0]['quantity']);
         self::assertEquals($sku, $response['addSimpleProductsToCart']['cart']['items'][0]['product']['sku']);
     }
 
@@ -57,10 +57,10 @@ public function testAddSimpleProductToCart()
     public function testAddProductToNonExistentCart()
     {
         $sku = 'simple_product';
-        $qty = 1;
+        $quantity = 1;
         $maskedQuoteId = 'non_existent_masked_id';
 
-        $query = $this->getQuery($maskedQuoteId, $sku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
         $this->graphQlMutation($query);
     }
 
@@ -73,10 +73,10 @@ public function testAddProductToNonExistentCart()
     public function testNonExistentProductToCart()
     {
         $sku = 'simple_product';
-        $qty = 1;
+        $quantity = 1;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
 
-        $query = $this->getQuery($maskedQuoteId, $sku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
         $this->graphQlMutation($query);
     }
 
@@ -88,9 +88,9 @@ public function testNonExistentProductToCart()
     public function testAddSimpleProductToCustomerCart()
     {
         $sku = 'simple_product';
-        $qty = 2;
+        $quantity = 2;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
-        $query = $this->getQuery($maskedQuoteId, $sku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
 
         $this->expectExceptionMessage(
             "The current user cannot perform operations on cart \"$maskedQuoteId\""
@@ -102,10 +102,10 @@ public function testAddSimpleProductToCustomerCart()
     /**
      * @param string $maskedQuoteId
      * @param string $sku
-     * @param int $qty
+     * @param float $quantity
      * @return string
      */
-    private function getQuery(string $maskedQuoteId, string $sku, int $qty): string
+    private function getQuery(string $maskedQuoteId, string $sku, float $quantity): string
     {
         return <<<QUERY
 mutation {  
@@ -115,7 +115,7 @@ private function getQuery(string $maskedQuoteId, string $sku, int $qty): string
       cartItems: [
         {
           data: {
-            qty: $qty
+            quantity: $quantity
             sku: "$sku"
           }
         }
@@ -124,7 +124,7 @@ private function getQuery(string $maskedQuoteId, string $sku, int $qty): string
   ) {
     cart {
       items {
-        qty
+        quantity
         product {
           sku
         }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddVirtualProductToCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddVirtualProductToCartTest.php
index 3f2d734635c3..cb429e7b9cb9 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddVirtualProductToCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddVirtualProductToCartTest.php
@@ -37,14 +37,14 @@ protected function setUp()
     public function testAddVirtualProductToCart()
     {
         $sku = 'virtual_product';
-        $qty = 2;
+        $quantity = 2;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
 
-        $query = $this->getQuery($maskedQuoteId, $sku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
         $response = $this->graphQlMutation($query);
 
         self::assertArrayHasKey('cart', $response['addVirtualProductsToCart']);
-        self::assertEquals($qty, $response['addVirtualProductsToCart']['cart']['items'][0]['qty']);
+        self::assertEquals($quantity, $response['addVirtualProductsToCart']['cart']['items'][0]['quantity']);
         self::assertEquals($sku, $response['addVirtualProductsToCart']['cart']['items'][0]['product']['sku']);
     }
 
@@ -57,10 +57,10 @@ public function testAddVirtualProductToCart()
     public function testAddVirtualToNonExistentCart()
     {
         $sku = 'virtual_product';
-        $qty = 1;
+        $quantity = 1;
         $maskedQuoteId = 'non_existent_masked_id';
 
-        $query = $this->getQuery($maskedQuoteId, $sku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
         $this->graphQlMutation($query);
     }
 
@@ -73,10 +73,10 @@ public function testAddVirtualToNonExistentCart()
     public function testNonExistentProductToCart()
     {
         $sku = 'virtual_product';
-        $qty = 1;
+        $quantity = 1;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
 
-        $query = $this->getQuery($maskedQuoteId, $sku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
         $this->graphQlMutation($query);
     }
 
@@ -89,9 +89,9 @@ public function testNonExistentProductToCart()
     public function testAddVirtualProductToCustomerCart()
     {
         $sku = 'virtual_product';
-        $qty = 2;
+        $quantity = 2;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
-        $query = $this->getQuery($maskedQuoteId, $sku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
 
         $this->expectExceptionMessage(
             "The current user cannot perform operations on cart \"$maskedQuoteId\""
@@ -103,10 +103,10 @@ public function testAddVirtualProductToCustomerCart()
     /**
      * @param string $maskedQuoteId
      * @param string $sku
-     * @param int $qty
+     * @param float $quantity
      * @return string
      */
-    private function getQuery(string $maskedQuoteId, string $sku, int $qty): string
+    private function getQuery(string $maskedQuoteId, string $sku, float $quantity): string
     {
         return <<<QUERY
 mutation {  
@@ -116,7 +116,7 @@ private function getQuery(string $maskedQuoteId, string $sku, int $qty): string
       cartItems: [
         {
           data: {
-            qty: {$qty}
+            quantity: {$quantity}
             sku: "{$sku}"
           }
         }
@@ -125,7 +125,7 @@ private function getQuery(string $maskedQuoteId, string $sku, int $qty): string
   ) {
     cart {
       items {
-        qty
+        quantity
         product {
           sku
         }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/CheckoutEndToEndTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/CheckoutEndToEndTest.php
index 7cd4e06a19e2..9b6207403d34 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/CheckoutEndToEndTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/CheckoutEndToEndTest.php
@@ -69,12 +69,12 @@ protected function setUp()
      */
     public function testCheckoutWorkflow()
     {
-        $qty = 2;
+        $quantity = 2;
 
         $sku = $this->findProduct();
         $cartId = $this->createEmptyCart();
         $this->setGuestEmailOnCart($cartId);
-        $this->addProductToCart($cartId, $qty, $sku);
+        $this->addProductToCart($cartId, $quantity, $sku);
 
         $this->setBillingAddress($cartId);
         $shippingMethod = $this->setShippingAddress($cartId);
@@ -161,11 +161,11 @@ private function setGuestEmailOnCart(string $cartId): void
 
     /**
      * @param string $cartId
-     * @param float $qty
+     * @param float $quantity
      * @param string $sku
      * @return void
      */
-    private function addProductToCart(string $cartId, float $qty, string $sku): void
+    private function addProductToCart(string $cartId, float $quantity, string $sku): void
     {
         $query = <<<QUERY
 mutation {  
@@ -175,7 +175,7 @@ private function addProductToCart(string $cartId, float $qty, string $sku): void
       cartItems: [
         {
           data: {
-            qty: {$qty}
+            quantity: {$quantity}
             sku: "{$sku}"
           }
         }
@@ -184,7 +184,7 @@ private function addProductToCart(string $cartId, float $qty, string $sku): void
   ) {
     cart {
       items {
-        qty
+        quantity
         product {
           sku
         }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetCartTest.php
index 8e4feb1d48e8..b35d689af7d2 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetCartTest.php
@@ -46,11 +46,11 @@ public function testGetCart()
         self::assertCount(2, $response['cart']['items']);
 
         self::assertNotEmpty($response['cart']['items'][0]['id']);
-        self::assertEquals(2, $response['cart']['items'][0]['qty']);
+        self::assertEquals(2, $response['cart']['items'][0]['quantity']);
         self::assertEquals('simple_product', $response['cart']['items'][0]['product']['sku']);
 
         self::assertNotEmpty($response['cart']['items'][1]['id']);
-        self::assertEquals(2, $response['cart']['items'][1]['qty']);
+        self::assertEquals(2, $response['cart']['items'][1]['quantity']);
         self::assertEquals('virtual-product', $response['cart']['items'][1]['product']['sku']);
     }
 
@@ -156,7 +156,7 @@ private function getQuery(string $maskedQuoteId): string
   cart(cart_id: "{$maskedQuoteId}") {
     items {
       id
-      qty
+      quantity
       product {
         sku
       }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/RemoveItemFromCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/RemoveItemFromCartTest.php
index 27f3f6367f66..77a057e52f68 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/RemoveItemFromCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/RemoveItemFromCartTest.php
@@ -96,7 +96,7 @@ public function testUpdateWithMissedItemRequiredParameters(string $input, string
   ) {
     cart {
       items {
-        qty
+        quantity
       }
     }
   }
@@ -179,7 +179,7 @@ private function getQuery(string $maskedQuoteId, int $itemId): string
   ) {
     cart {
       items {
-        qty
+        quantity
       }
     }
   }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetPaymentMethodOnCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetPaymentMethodOnCartTest.php
index 4ea7eac290f8..1b2ceecd213a 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetPaymentMethodOnCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetPaymentMethodOnCartTest.php
@@ -164,7 +164,7 @@ public function testSetPaymentMethodWithoutRequiredParameters(string $input, str
   ) {
     cart {
       items {
-        qty
+        quantity
       }
     }
   }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/UpdateCartItemsTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/UpdateCartItemsTest.php
index 1b8cf2e1c57f..1e1fb0a17699 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/UpdateCartItemsTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/UpdateCartItemsTest.php
@@ -51,15 +51,15 @@ protected function setUp()
     /**
      * @magentoApiDataFixture Magento/Checkout/_files/quote_with_simple_product_saved.php
      */
-    public function testUpdateCartItemQty()
+    public function testUpdateCartItemQuantity()
     {
         $quote = $this->quoteFactory->create();
         $this->quoteResource->load($quote, 'test_order_with_simple_product_without_address', 'reserved_order_id');
         $maskedQuoteId = $this->quoteIdToMaskedId->execute((int)$quote->getId());
         $itemId = (int)$quote->getItemByProduct($this->productRepository->get('simple'))->getId();
-        $qty = 2;
+        $quantity = 2;
 
-        $query = $this->getQuery($maskedQuoteId, $itemId, $qty);
+        $query = $this->getQuery($maskedQuoteId, $itemId, $quantity);
         $response = $this->graphQlMutation($query);
 
         $this->assertArrayHasKey('updateCartItems', $response);
@@ -69,7 +69,7 @@ public function testUpdateCartItemQty()
         $item = current($responseCart['items']);
 
         $this->assertEquals($itemId, $item['id']);
-        $this->assertEquals($qty, $item['qty']);
+        $this->assertEquals($quantity, $item['quantity']);
     }
 
     /**
@@ -81,9 +81,9 @@ public function testRemoveCartItemIfQuantityIsZero()
         $this->quoteResource->load($quote, 'test_order_with_simple_product_without_address', 'reserved_order_id');
         $maskedQuoteId = $this->quoteIdToMaskedId->execute((int)$quote->getId());
         $itemId = (int)$quote->getItemByProduct($this->productRepository->get('simple'))->getId();
-        $qty = 0;
+        $quantity = 0;
 
-        $query = $this->getQuery($maskedQuoteId, $itemId, $qty);
+        $query = $this->getQuery($maskedQuoteId, $itemId, $quantity);
         $response = $this->graphQlMutation($query);
 
         $this->assertArrayHasKey('updateCartItems', $response);
@@ -180,7 +180,7 @@ public function testUpdateWithMissedCartItemId()
     cart {
       items {
         id
-        qty
+        quantity
       }
     }
   }
@@ -210,7 +210,7 @@ public function testUpdateWithMissedItemRequiredParameters(string $input, string
     cart {
       items {
         id
-        qty
+        quantity
       }
     }
   }
@@ -236,7 +236,7 @@ public function dataProviderUpdateWithMissedRequiredParameters(): array
             ],
             'missed_cart_item_qty' => [
                 'cart_items: [{ cart_item_id: 1 }]',
-                'Required parameter "quantity" for "cart_items" is missing.'
+                'Field CartItemUpdateInput.quantity of required type Float! was not provided.'
             ],
         ];
     }
@@ -244,10 +244,10 @@ public function dataProviderUpdateWithMissedRequiredParameters(): array
     /**
      * @param string $maskedQuoteId
      * @param int $itemId
-     * @param float $qty
+     * @param float $quantity
      * @return string
      */
-    private function getQuery(string $maskedQuoteId, int $itemId, float $qty): string
+    private function getQuery(string $maskedQuoteId, int $itemId, float $quantity): string
     {
         return <<<QUERY
 mutation {
@@ -256,14 +256,14 @@ private function getQuery(string $maskedQuoteId, int $itemId, float $qty): strin
     cart_items: [
       {
         cart_item_id: {$itemId}
-        quantity: {$qty}
+        quantity: {$quantity}
       }
     ]
   }) {
     cart {
       items {
         id
-        qty
+        quantity
       }
     }
   }