updateCartItem

Requires a customer (portal or buyer app) session.

Sets the quantity of one cart line. Pass the cart revision you last saw, and an operation ID so a retry applies once.

Errors: a failed call returns a GraphQL errors entry, not a field on the result, and data may be null or partial. Read the entry's extensions.code and message; every shape and code is in the Error reference.

Example:

GraphQL

mutation UpdateCartItem($input: UpdateCartItemInput!) {
  updateCartItem(input: $input) {
    id
    name
    itemCount
    revision
    subtotal
    updatedAt
    items {
      id
      createdAt
      acceptAlternativeIfUnavailable
      baseUnitPrice
      lineTotal
      notes
    }
  }
}

cURL

curl -X POST "https://<api-host>/graphql" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $ACCESS_TOKEN" \
  --data @- <<'EOF'
{
  "query": "mutation UpdateCartItem($input: UpdateCartItemInput!) {\n  updateCartItem(input: $input) {\n    id\n    name\n    itemCount\n    revision\n    subtotal\n    updatedAt\n    items {\n      id\n      createdAt\n      acceptAlternativeIfUnavailable\n      baseUnitPrice\n      lineTotal\n      notes\n    }\n  }\n}",
  "variables": {
    "input": {
      "cartItemId": "id",
      "quantity": 0
    }
  }
}
EOF

Variables:

{
  "input": {
    "cartItemId": "id",
    "quantity": 0
  }
}

Response:

{
  "data": {
    "updateCartItem": {
      "id": "id",
      "name": "string",
      "itemCount": 0,
      "revision": 0,
      "subtotal": 0,
      "updatedAt": "2025-01-15T00:00:00Z",
      "items": [
        {
          "id": "id",
          "createdAt": "2025-01-15T00:00:00Z",
          "acceptAlternativeIfUnavailable": true,
          "baseUnitPrice": 0,
          "lineTotal": 0,
          "notes": "string"
        }
      ]
    }
  }
}

updateCartItem(
  input: UpdateCartItemInput!
): CartType!

Arguments

updateCartItem.input ● UpdateCartItemInput! non-null input

The cart line, its new quantity above zero, the expected cart revision and the operation ID.

Type

CartType object

The customer's cart.