---
title: cartBuyerIdentityUpdate - Storefront API
description: >
  Updates customer information associated with a cart.

  Buyer identity is used to determine

  [international
  pricing](https://shopify.dev/custom-storefronts/internationalization/international-pricing)

  and should match the customer's shipping address.
api_version: 2026-01
api_name: storefront
type: mutation
api_type: graphql
source_url:
  html: >-
    https://shopify.dev/docs/api/storefront/latest/mutations/cartBuyerIdentityUpdate
  md: >-
    https://shopify.dev/docs/api/storefront/latest/mutations/cartBuyerIdentityUpdate.md
---

# cart​Buyer​Identity​Update

mutation

Updates customer information associated with a cart. Buyer identity is used to determine [international pricing](https://shopify.dev/custom-storefronts/internationalization/international-pricing) and should match the customer's shipping address.

## Arguments

* buyerIdentity
* cartId

***

## Cart​Buyer​Identity​Update​Payload returns

* cart
* userErrors
* warnings

***

## Examples

* ### cartBuyerIdentityUpdate reference