Mentioned in the evidence
- carts/update webhooks
- Global Catalog REST API
- Checkout UI extensions
- Customer Account UI extensions
- POS UI extensions 2026-10 cart mutations and percentage discounts
Official sources
- 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
- 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) ↗
POS UI extensions now return percentage values for percentage discounts
- Shopify developer changelog (changelog) ↗
Cart mutations reject unconfirmed writes in POS UI extensions 2026-10
This is a global change, verified against Shopify’s own sources. It is not an assessment of your systems or your impact.