# CartLinesUpdatePayload

Payload returned by the cartLinesUpdate mutation. This type contains the updated cart data and any errors that occurred during the cart lines update operation.

## Type Definition

```graphql
type CartLinesUpdatePayload {
  cart: Cart
  userErrors: [UserError]!
}
```

## Fields

| Field | Type | Description |
|-------|------|-------------|
| `cart` | `Cart` | The updated cart |
| `userErrors` | `[UserError]!` | List of errors that occurred during cart lines update |

## Relationships

`CartLinesUpdatePayload` is returned by the `cartLinesUpdate` mutation. It contains a reference to the updated `Cart` object and provides a list of `UserError` objects that detail any validation or processing errors that occurred during the cart lines update operation.

## Example

```graphql
{
  cartLinesUpdate(cartId: "eyJhbGciOiJIUzI1NiJ9...", lines: [{id: "12345", quantity: 2}]) {
    cart {
      id
      totalQuantity
    }
    userErrors {
      field
      message
    }
  }
}
```

## Implements

This type does not implement any interfaces.

## Related Types

- [Cart](/reference/storefront/v1/objects/cart)
- [UserError](/reference/storefront/v1/objects/user-error)