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What it means

That quote was already used to create a delivery, and a quote can be used once.

Common causes

  • The same quote id was sent in two create calls with different idempotency keys.
  • A client bug that creates twice from one quote.

What to do

  • Request a new quote for the next delivery.
  • To retry safely, repeat the identical create with the same Idempotency-Key instead of creating again.
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