Issue with cartBuyerIdentityUpdate not persisting in Shopify Headless Checkout

Hydrogen and Storefront APIs
1

Hey everyone,

during our Shopify Headless implementation, we encountered an issue with user authentication and cart buy identity persistence. Here’s the user flow:

A user logs in on our site. After a successful login, we update the cart’s buyer identity using cartBuyerIdentityUpdate. The GraphQL response returns a 200 status with no errors, and the updated buyer identity appears correctly in the cart session response.

However, when the user proceeds to checkout via the generated checkout URL:

The user information is not prefilled or associated with the checkout.

Instead, the user is redirected to the login page specified in our Shopify configuration.

Has anyone encountered a similar issue? Any insights on how to ensure the buyer identity persists in checkout?

Thanks in advance!

PS: I’m also testing all the calls directly in the Shopify GraphiQL app with the same result, the user identity is NOT associated with the checkout.

2

Hi, are you using the customer account API for authenticating the user? Are you using Hydrogen or your own headless setup?

3

We use our own headless setup with the Headless (Storefront API). With the graphql following endpoints customerAccessTokenCreate and cartBuyerIdentityUpdate.

4

This problem has also been mentioned several times in the following Github thread: https://github.com/Shopify/storefront-api-feedback/discussions/105#discussioncomment-12799379, which describes the problem