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Its problem type: https://developers.tassyir.io/errors/idempotency-key-reused.

What to do

HTTP 422. You reused an Idempotency-Key with another method, path, query or body. Use a new key for a different write.

Answered by

HTTP 422, from: The shape of every problem, and how @tassyir/app reports it: Errors.