{
  "request": {
    "method": "POST",
    "url": "https://api.tingg.africa/api/v2/engagement",
    "headers": {
      "Authorization": "Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...",
      "Content-Type": "application/json"
    },
    "body": {
      "notificationType": "OTP",
      "channels": ["SMS"],
      "referenceID": "ref-cas-123",
      "callbackUrl": "https://merchant.example.co.ke/sms/callback",
      "smsDto": {
        "msisdn": ["254712345678"],
        "message": "Your Tingg OTP is ${code}. Valid for 5 minutes.",
        "params": { "code": "648291" },
        "senderID": "TINGG"
      }
    }
  },
  "response": {
    "status": 200,
    "body": {
      "transactionID": "8f6b2c80-43f7-4f78-b1d2-7a3a5d6c1e0a",
      "statusCode": 200,
      "message": "Message queued successfully."
    }
  }
}