Hey @Andrew_Jaanuu, the 2026-01 changelog has some information regarding the mutations the idempotency directive is available on: Adding idempotency for inventory adjustments and refund mutations - Shopify developer changelog
However the changes seem to not yet be fully rolled out: Idempotency directive not required or preventing duplicate inventoryAdjustQuantities requests
The idempotency docs you referenced state that the individual mutation pages in the docs will specify if the mutation supports the directive. I don’t see anything on the store credit mutations currently