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Use Idempotency-Key when sending messages from your backend.
If you retry the same request with the same key and same content, WADial returns the original message result instead of sending a duplicate. If the same key is reused with different message content, WADial returns a 409 conflict. Good keys are stable for one business action:
  • order-123-ready-v1
  • invoice-987-reminder-1
  • ticket-456-assigned
Do not use timestamps or random values for retries, because each retry would look like a new send.