6. Webhook Notification Event Structure

Receive real-time webhook notifications for all payment events. Includes transaction completion, processing updates, and failure alerts with cryptographic signatures for security.

POSThttps://merchant-api.yourdomain.com/webhooks/payments

Required Headers

X-exxari-Signature:t=1717058340,v1=7a5f6e8d2c1b3f...

Content-Type:application/json

Response

Response Payload

{
  "event": "transaction.completed",
  "created_at": "2026-05-30T08:39:00Z",
  "data": {
    "transaction_reference": "TXN-CARD-90811A",
    "amount": 2500,
    "currency": "GHS",
    "status": "success",
    "customer": {
      "email": "customer@example.com"
    }
  }
}