createdAt is now available on the Customer object in Shopify Functions
Shopify developer change
MerchantDiff detected this entry in Shopify's official developer changelog on July 30, 2026.
This Shopify update is categorized as API, New, Functions, 2026-10.
What changed
The Customer object now exposes createdAt, which returns the date and time when the customer account was created. This lets you build customizations based on when a customer joined. To use createdAt, request it from the customer on Cart.buyerIdentity in the Function input query: query Input { cart { buyerIdentity { customer { createdAt } } } } The customer is available only when the buyer is signed in. Functions should continue to handle guest buyers, where buyerIdentity or customer might be null or omitted. Earlier Shopify Functions API versions are unchanged.
Who is affected
Developers building Shopify Functions should review this change.
What action may be needed
Review whether the new capability is relevant to your app. If you plan to use it, test the affected API or workflow before adopting it in production.
Use the official Shopify entry below as the source of truth for technical implementation details, affected APIs, migration instructions and deadlines.
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