# CartLinesUpdateInput

Input for updating a cart line item with new quantity and customization details.

## Input Definition

```graphql
input CartLinesUpdateInput {
  id: Int!
  quantity: Int!
  customizations: [CustomizationGroupOptionInput]
}
```

## Fields

| Field | Type | Required | Description |
|-------|------|----------|-------------|
| id | Int | Yes | The ID of the cart line item to update |
| quantity | Int | Yes | The quantity of the merchandise item to update |
| customizations | [CustomizationGroupOptionInput] | No | List of customizations for the merchandise item |

## Example

```graphql
mutation {
  updateCartLine(input: {
    id: 42
    quantity: 3
    customizations: [
      {
        groupId: 1
        optionId: 5
      }
    ]
  }) {
    cart {
      id
      lines {
        id
        quantity
      }
    }
  }
}
```

## Related Types

- [CustomizationGroupOptionInput](/docs/api/graphql/input-types/customization-group-option-input)