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What it means

The idempotency key was already used with a different body, or the first request with that key is still running.

Common causes

  • The same Idempotency-Key was reused for a different delivery or store.
  • A retry changed something in the body.
  • Two requests with the same key arrived at once.

What to do

  • Generate one new key per operation, and reuse a key only to repeat the identical request.
  • When the first request is still being processed, wait a moment and repeat the identical request.
Every error response carries an error.request_id. Quote it if you write to support, and read Debugging your integration to look the call up yourself. All errors