# checkoutShippingLineUpdate - storefront - MUTATION
Version: 2024-04

## Description
Updates the shipping lines on an existing checkout.

### Access Scopes
`unauthenticated_write_checkouts` access scope.


## Arguments
* [checkoutId](/docs/api/storefront/2024-04/scalars/ID): ID! - The ID of the checkout.
* [shippingRateHandle](/docs/api/storefront/2024-04/scalars/String): String! - A unique identifier to a Checkout’s shipping provider, price, and title combination, enabling the customer to select the availableShippingRates.


## Returns
* [checkout](/docs/api/storefront/2024-04/objects/Checkout): Checkout The updated checkout object.
* [checkoutUserErrors](/docs/api/storefront/2024-04/objects/CheckoutUserError): CheckoutUserError! The list of errors that occurred from executing the mutation.
* [userErrors](/docs/api/storefront/2024-04/objects/UserError): UserError! The list of errors that occurred from executing the mutation.


## Examples