Improved user errors on the `fulfillmentOrderCancel` mutation
Shopify developer change
MerchantDiff detected this entry in Shopify's official developer changelog on April 01, 2026.
This Shopify update is categorized as API, Update, Admin GraphQL API, 2026-04.
What changed
The error response now includes a code field for easier programmatic error handling and identification. Why we made this change: This enhancement supports the new feature for manually marking fulfillment orders as in-progress, which allows merchants to self-report progress on their fulfillment orders. As part of this feature, cancelling fulfillment orders with reported progress is now restricted, and the enhanced error responses help developers handle these restrictions more effectively.
Who is affected
Apps using the affected Shopify GraphQL API surface should review this change.
What action may be needed
Review the official Shopify entry, confirm whether the change touches your app, and test the affected workflow before your next relevant deployment.
Use the official Shopify entry below as the source of truth for technical implementation details, affected APIs, migration instructions and deadlines.
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