--- title: "Shopify owner_type required on metafield declarations in Checkout and Customer Account UI extensions from API version 2027-01: 2026-10-08 | Harbyn" description: "Shopify owner_type required on metafield declarations in Checkout and Customer Account UI extensions from API version 2027-01, announced Oct 8, 2026." canonical: "https://harbyn.com/changes/shopify/2026-10-08-new-owner-type-field-for-metafield-declarations-in-checkout-and-customer-acc-2" last-updated: 2026-10-09 --- # Shopify owner\_type required on metafield declarations in Checkout and Customer Account UI extensions from API version 2027-01 Markdown version of . Breaking change - Shopify. medium severity. Announced. Checkout and Customer Account UI extensions that declare metafields in shopify.extension.toml must set owner\_type (for example PRODUCT or CUSTOMER) on every declaration from API version 2027-01; deployments with a declaration missing it are blocked. owner\_type can be added now on 2026-10, and extensions without metafield declarations are unaffected. ## Facts | Fact | Value | | --- | --- | | Vendor | [Shopify](https://harbyn.com/vendors/shopify.md) | | Kind | Breaking change | | Severity | medium | | Status | Announced | | Announced | Oct 8, 2026 | | Added to Harbyn | Oct 9, 2026 | | Lead time | No dated deadline | | API versions | `2027-01` | | Symbols | `owner_type` | | Vendor page | | | Review | Reviewed by a person, extracted by a model | ## Find it in your code ```sh npx harbyn scan ``` The scanner reads your repository on your machine and reports every file and line that uses the identifiers above. Nothing leaves your machine. ## Sources Where this event comes from: the page we read, when we read it, and the hash of that snapshot. - (changelog, fetched 2026-10-09 13:28 UTC, sha256 `1c0330865885784b65802737932ba7d5159108ddee8e284c47605d6f8acfec55`) ## Related changes ### More from Shopify - [Product view events include currency](https://harbyn.com/changes/shopify/2026-10-08-hydrogen-developer-preview-update-october-8-2026.md) (Behavior change, announced Oct 8, 2026) - [POS UI extensions 2026-10 cart mutations reject unconfirmed writes](https://harbyn.com/changes/shopify/2026-10-07-cart-mutations-reject-unconfirmed-writes-in-pos-ui-extensions-2026-10.md) (Breaking change, announced Oct 7, 2026) - [POS UI extensions return percentage values for percentage discounts](https://harbyn.com/changes/shopify/2026-10-07-pos-ui-extensions-now-return-percentage-values-for-percentage-discounts.md) (Breaking change, announced Oct 7, 2026) - [Global Catalog REST API stops serving traffic on November 2, 2026](https://harbyn.com/changes/shopify/2026-10-09-global-catalog-rest-api-stops-serving-traffic-on-november-2-2026.md) (Retirement, effective Nov 2, 2026) ### Changes at other vendors - [Amazon Selling Partner API: October listing attribute usage and enumeration value updates](https://harbyn.com/changes/amazon-sp-api/2026-10-14-sp-api-updates-new-listings-items-api-ivp-values-in-eu5-jp-and-ca-stores-oct-2.md) (effective Oct 26, 2026) - [Supabase: four CBC-mode TLS 1.2 cipher suites will be removed from project HTTP APIs](https://harbyn.com/changes/supabase/2026-10-12-an-outdated-subset-of-tls-1-2-ciphers-will-be-disabled-on-project-http-apis.md) (effective Nov 10, 2026) - [Google Workspace APIs: OAuth clients must be marked as agentic to call Google Workspace MCP servers](https://harbyn.com/changes/google-workspace/2026-10-12-oauth-clients-must-be-marked-as-agentic-to-call-google-workspace-mcp-servers.md) (effective Nov 11, 2026) - [Bitbucket Cloud API: Git Credential Manager upgrade required for OAuth 2.0 Git authentication](https://harbyn.com/changes/bitbucket/2026-10-13-git-credential-manager-upgrade-required-for-oauth-2-0-git-authentication.md) (effective Nov 30, 2026) [All upcoming deadlines](https://harbyn.com/deadlines.md)