- Setting DiscountCountriesInput.includeRestOfWorld to true now returns a BAD_REQUEST error in Admin GraphQL API version 2027-01; apps must provide explicit country codes via the add field.
- Only false or null values keep the old behavior; earlier API versions (2026-10 and before) continue to work unchanged.
- Update discount create/update mutations to replace includeRestOfWorld:true with a full list of applicable countries and test against the 2027-01 version.