If quantity is set to zero than the product will be removed from the cart. Negative quantity is not allowed and will result in error.

​
Arguments

​
input
CartItemsUpdateInput!
required
The input object contains the unique identifier (ID) for the cart and the items with their quantities that need to be updated.

​
Returns

​
CartResponse.*
CartResponse
Any requested field from the CartResponse object.

​
Example - request

Query arguments
{
    "input": {
        "id": "{{cartId}}",
        "items": {
            "amazonCartItemsInput": [{
                "quantity": 1,
                "productId": "{{productId}}"
            }],
            "shopifyCartItemsInput": [{
                "quantity": 1,
                "variantId": "{{variantId}}"
            }]
        }
    }
}
GraphQL
mutation ($input: CartItemsUpdateInput!) {
    updateCartItems(input: $input) {
        cart {
            cost {
                isEstimated
                subtotal {
                    value
                    displayValue
                    currency
                }
                tax {
                    value
                    displayValue
                    currency
                }
                shipping {
                    value
                    displayValue
                    currency
                }
                total {
                    value
                    displayValue
                    currency
                }
            }
            id
            buyerIdentity {
                firstName
                lastName
                address1
                address2
                city
                provinceCode
                countryCode
                postalCode
                email
                phone
            }
            stores {
                ... on AmazonStore {
                    errors {
                        code
                        message
                        details {
                            productIds
                        }
                    }
                    store
                    cartLines {
                        quantity
                        product {
                            id
                        }
                    }
                    offer {
                        errors {
                            code
                            message
                            details {
                                ... on AmazonOfferErrorDetails {
                                productIds
                            }
                            }
                        }
                        subtotal {
                            value
                            displayValue
                            currency
                        }
                        margin {
                            value
                            displayValue
                            currency
                        }
                        notAvailableIds
                        shippingMethods {
                            id
                            label
                            price {
                                value
                                displayValue
                                currency
                            }
                            taxes {
                                value
                                displayValue
                                currency
                            }
                            total {
                                value
                                displayValue
                                currency
                            }
                        }

                        selectedShippingMethod {
                            id
                            label
                            price {
                                value
                                displayValue
                                currency
                            }
                            taxes {
                                value
                                displayValue
                                currency
                            }
                            total {
                                value
                                displayValue
                                currency
                            }
                        }
                    }
                }
                ... on ShopifyStore {
                    errors {
                        code
                        message
                        details {
                            variantIds
                        }
                    }
                    store
                    cartLines {
                        quantity
                        variant {
                            id
                        }
                    }
                    offer {
                        errors {
                            code
                            message
                            details {
                                ... on ShopifyOfferErrorDetails {
                                variantIds
                            }
                            }
                        }
                        subtotal {
                            value
                            displayValue
                            currency
                        }
                        margin {
                            value
                            displayValue
                            currency
                        }
                        notAvailableIds
                        shippingMethods {
                            id
                            label
                            price {
                                value
                                displayValue
                                currency
                            }
                            taxes {
                                value
                                displayValue
                                currency
                            }
                            total {
                                value
                                displayValue
                                currency
                            }
                        }

                        selectedShippingMethod {
                            id
                            label
                            price {
                                value
                                displayValue
                                currency
                            }
                            taxes {
                                value
                                displayValue
                                currency
                            }
                            total {
                                value
                                displayValue
                                currency
                            }
                        }
                    }
                }
            }
        }
        errors {
            code
            message
        }
    }
}

​
Example - response

Response
{
    "data": {
        "updateCartItems": {
            "cart": {
                "id": "KVER2EJJ1kqrjI4H1fbi",
                "buyerIdentity": {
                    "firstName": "John",
                    "lastName": "Doe",
                    "address1": "360 w 34th st",
                    "address2": "{{address2}}",
                    "city": "new york",
                    "provinceCode": "WA",
                    "countryCode": "US",
                    "postalCode": "98052",
                    "email": "[[email protected]](/cdn-cgi/l/email-protection)",
                    "phone": "4250000000"
                },
                "stores": [
                    {
                        "errors": [],
                        "store": "rye-test-store.myshopify.com",
                        "cartLines": [
                            {
                                "quantity": 3,
                                "variant": {
                                    "id": "39943631962199"
                                }
                            }
                        ],
                        "offer": {
                            "errors": [],
                            "subtotal": {
                                "value": 30000,
                                "displayValue": "$300.00",
                                "currency": "USD"
                            },
                            "margin": {
                                "value": 0,
                                "displayValue": "$0.00",
                                "currency": "USD"
                            },
                            "notAvailableIds": [],
                            "shippingMethods": [
                                {
                                    "id": "0-Economy",
                                    "label": "Economy",
                                    "price": {
                                        "value": 0,
                                        "displayValue": "$0.00",
                                        "currency": "USD"
                                    },
                                    "taxes": {
                                        "value": 0,
                                        "displayValue": "$0.00",
                                        "currency": "USD"
                                    },
                                    "total": {
                                        "value": 30000,
                                        "displayValue": "$300.00",
                                        "currency": "USD"
                                    }
                                },
                                {
                                    "id": "3-SonicSound",
                                    "label": "SonicSound",
                                    "price": {
                                        "value": 300,
                                        "displayValue": "$3.00",
                                        "currency": "USD"
                                    },
                                    "taxes": {
                                        "value": 0,
                                        "displayValue": "$0.00",
                                        "currency": "USD"
                                    },
                                    "total": {
                                        "value": 30300,
                                        "displayValue": "$303.00",
                                        "currency": "USD"
                                    }
                                }
                            ]
                        }
                    },
                    {
                        "errors": [],
                        "store": "amazon",
                        "cartLines": [
                            {
                                "quantity": 3,
                                "product": {
                                    "id": "B00A2KD8NY"
                                }
                            }
                        ],
                        "offer": {
                            "errors": [],
                            "subtotal": {
                                "value": 2385,
                                "displayValue": "$23.85",
                                "currency": "USD"
                            },
                            "margin": {
                                "value": 0,
                                "displayValue": "$0.00",
                                "currency": "USD"
                            },
                            "notAvailableIds": [],
                            "shippingMethods": [
                                {
                                    "id": "3.99-Default shipping method",
                                    "label": "Default shipping method",
                                    "price": {
                                        "value": 399,
                                        "displayValue": "$3.99",
                                        "currency": "USD"
                                    },
                                    "taxes": {
                                        "value": 0,
                                        "displayValue": "$0.00",
                                        "currency": "USD"
                                    },
                                    "total": {
                                        "value": 2784,
                                        "displayValue": "$27.84",
                                        "currency": "USD"
                                    }
                                }
                            ]
                        }
                    }
                ]
            },
            "errors": []
        }
    }
}

​
Errors

If the cart is not found then a corresponding error is returned
JSON
{
    "errors": [
        {
            "message": "Cart not found: someInvalidCartId",
            "path": [
                "updateCartItems"
            ],
            "extensions": {
                "code": "CART_NOT_FOUND_ERROR"
            }
        }
    ],
    "data": null
}
If the cart is expired (older than 10 days) then a corresponding error is returned
JSON
{
    "errors": [
        {
            "message": "Cart expired: someExpiredCartId",
            "path": [
                "updateCartItems"
            ],
            "extensions": {
                "code": "CART_EXPIRED_ERROR"
            }
        }
    ],
    "data": null
}
If the provided product/variant quantity is then zero then UPDATE_PRODUCTS_FAILED error is returned
JSON
{
    "data": {
        "updateCartItems": {
            "cart": {
                "id": "JOTxszhBZDl4xtTi3Fpi",
                "stores": [
                    {
                        "errors": [
                            {
                                "code": "UPDATE_PRODUCTS_FAILED",
                                "message": "Product quantity must be greater or equal to zero",
                                "details": {
                                    "variantIds": [
                                        "39943631962199"
                                    ]
                                }
                            }
                        ],
                        "store": "rye-test-store.myshopify.com",
                        "cartLines": [
                            {
                                "quantity": 1,
                                "variant": {
                                    "id": "39943631962199"
                                }
                            }
                        ]
                    }
                ]
            },
            "errors": []
        }
    }
}
If the cart is already submitted then CART_MODIFICATION_FORBIDDEN error is returned If products are not present in the cart then UPDATE_PRODUCTS_FAILED error is returned
JSON
{
    "data": {
        "updateCartItems": {
            "cart": {
                "id": "rWTUnzLhsq0sHmO5HWhx",
                "stores": [
                    {
                        "errors": [
                            {
                                "code": "UPDATE_PRODUCTS_FAILED",
                                "message": "Variant to update not found in the store \"rye-test-store.myshopify.com\". Variant ID: 40147641892951",
                                "details": null
                            }
                        ]
                    }
                ]
            },
            "errors": []
        }
    }
}