---
title: CartBuyerIdentityUpdatePayload - Storefront API
description: Return type for `cartBuyerIdentityUpdate` mutation.
api_version: 2026-01
api_name: storefront
type: payload
api_type: graphql
source_url:
  html: https://shopify.dev/docs/api/storefront/latest/payloads/cartbuyeridentityupdatepayload
  md: https://shopify.dev/docs/api/storefront/latest/payloads/cartbuyeridentityupdatepayload.md
---

# Cart​Buyer​Identity​Update​Payload

payload

Return type for `cartBuyerIdentityUpdate` mutation.

## Fields

* cart

  [Cart](https://shopify.dev/docs/api/storefront/latest/objects/Cart)

  The updated cart.

* user​Errors

  [\[Cart​User​Error!\]!](https://shopify.dev/docs/api/storefront/latest/objects/CartUserError)

  non-null

  The list of errors that occurred from executing the mutation.

* warnings

  [\[Cart​Warning!\]!](https://shopify.dev/docs/api/storefront/latest/objects/CartWarning)

  non-null

  A list of warnings that occurred during the mutation.

***

## Mutations with this payload

* [cart​Buyer​Identity​Update](https://shopify.dev/docs/api/storefront/latest/mutations/cartBuyerIdentityUpdate)

  mutation

  Updates the buyer identity on a [`Cart`](https://shopify.dev/docs/api/storefront/2026-01/objects/Cart), including contact information, location, and checkout preferences. The buyer's country determines [international pricing](https://shopify.dev/docs/storefronts/headless/building-with-the-storefront-api/markets/international-pricing) and should match their shipping address.

  Use this mutation to associate a logged-in customer via access token, set a B2B company location, or configure checkout preferences like delivery method. Preferences prefill checkout fields but don't sync back to the cart if overwritten at checkout.

  * cart​Id

    [ID!](https://shopify.dev/docs/api/storefront/latest/scalars/ID)

    required

    ### Arguments

    The ID of the cart.

  * buyer​Identity

    [Cart​Buyer​Identity​Input!](https://shopify.dev/docs/api/storefront/latest/input-objects/CartBuyerIdentityInput)

    required

    The customer associated with the cart. Used to determine [international pricing](https://shopify.dev/custom-storefronts/internationalization/international-pricing). Buyer identity should match the customer's shipping address.

  ***

***

## Map

### Mutations with this payload

* [cart​Buyer​Identity​Update](https://shopify.dev/docs/api/storefront/latest/types/cartBuyerIdentityUpdate)