- Add optional @idempotent directive for inventory and refund mutations to prevent duplicate operations on retries.
- Support a wide range of inventory and refund mutations with idempotency keys, with plans to make it mandatory in version 2026-04.
- Introduce new error codes (IDEMPOTENCY_CONCURRENT_REQUEST, IDEMPOTENCY_KEY_PARAMETER_MISMATCH) and update docs for usage.
Adding idempotency for inventory adjustments and refund mutations
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