{
  "request": {
    "method": "POST",
    "url": "https://merchant.example.com/ebanx/notifications",
    "headers": {
      "Content-Type": "application/x-www-form-urlencoded",
      "X-EBANX-Signature": "v1=4e3b1f6a..."
    },
    "body": "notification_type=update&operation=payment_status_change&hash=5d3a32sd29q2sd&merchant_payment_code=ORDER-1001"
  },
  "response": {
    "status": 200,
    "body": "OK"
  },
  "notes": "Merchant must respond 200 within 10 seconds. After receiving the notification, query /ws/query with the hash to retrieve the authoritative payment state."
}