Starting with API version 2026-10 , Checkout and Customer Account UI extensions can specify an owner_type for each metafield declaration in shopify.extension.toml . Starting with API version 2027-01 , owner_type is required for every metafield declaration, and deployments without it will be blocked.
Summary extracted from the official source text. Verify details on the source page.
| Platform | Shopify |
|---|---|
| Effective date | No date published |
| Precision | n/a |
| Published | 2026-10-08 |
| Categories | Breaking / action required |
| Tags | 2026-10, API, Action Required, Checkout UI, Customer Accounts, Update |
| Official source | Shopify developer changelog ↗ |
| Fetched | 2026-10-17T03:44:00+00:00 |
| First seen | 2026-10-17T01:05:46+00:00 |
| Status | Listed by the source |
| Stable ID | shopify-9b068e95b8 · JSON |