- Added a `createdAt` timestamp field to the Customer object in the Shopify Functions API version 2026-10.
- Functions can now query a signed‑in customer's creation date via `Cart.buyerIdentity` and must include the field in their input query.
- The change is additive; existing Functions remain functional but should handle null/absent customer data for guest buyers.
createdAt is now available on the Customer object in Shopify Functions
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