Mentioned in the evidence
- Global Catalog REST API
- carts/update webhooks
- GraphQL Admin API timestamp filters
- Checkout and Customer Account UI extension metafield declarations
- POS UI extension cart mutations
Official sources
- Shopify developer changelog (changelog) ↗
Exclusive > timestamp filters exclude the full second
- Shopify developer changelog (changelog) ↗
Cart mutations reject unconfirmed writes in POS UI extensions 2026-10
- Shopify developer changelog (changelog) ↗
New `owner_type` field for metafield declarations in Checkout and Customer Account UI extensions, required in 2027-01
- Shopify developer changelog (changelog) ↗
Global Catalog REST API stops serving traffic on November 2, 2026
- Shopify developer changelog (changelog) ↗
Cart updates that result in no changes to the cart no longer trigger carts/update webhooks
This is a global change, verified against Shopify’s own sources. It is not an assessment of your systems or your impact.