---
title: cartBuyerIdentityUpdateDefault
description: Creates a function that accepts an object of [CartBuyerIdentityInput](/docs/api/storefront/2023-07/input-objects/CartBuyerIdentityInput) and updates the buyer identity of a cart
api_version: 2026-04
api_name: hydrogen
source_url:
  html: https://shopify.dev/docs/api/hydrogen/latest/utilities/cartbuyeridentityupdatedefault
  md: https://shopify.dev/docs/api/hydrogen/latest/utilities/cartbuyeridentityupdatedefault.md
---

cart​Buyer​Identity​Update​Default

Not supported in this version.