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Use Idempotency-Key when sending messages from your backend. 
POST /api/v1/sessions/{sessionId}/messages
Authorization: Bearer <api_key>
Content-Type: application/json
Idempotency-Key: order-123-ready-v1
WADial stores the key with the outgoing message. If you retry the same request with the same key and same content, WADial returns the stored message record 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.