Shopify 2026-10 API Deprecates owner_type, Requires Global IDs in metafieldsSet
A developer warns that the Shopify 2026-10 API version contains a breaking change to the metafieldsSet mutation that can cause failures in production pipelines once the deprecation window closes. The owner_type argument, which previously let developers specify resource kinds for batch metafield writes, is deprecated in this version. Shopify now requires the ownerId field to be a fully qualified Global ID that matches the metafield definition's namespace. Payloads that fail this check may return an INVALID_OWNER error or be silently dropped, depending on how an integration handles errors. The author recommends constructing Global IDs explicitly in client code and treating such errors as fatal rather than as warnings.
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