Sample Callback Response

When configuring your Callback URL, you will need to specify whether your endpoint expects to receive HTTP GET or HTTP POST requests.

Subsequently, when an event occurs (such as a transaction status update), IIMMPACT will send an HTTP request using your chosen method.

Below is an illustrative example of the data sent in a callback:

For these callbacks to reach your system successfully, it is essential to add IIMMPACT's IP address to your whitelist

Production IP Address	18.140.170.98
Staging IP Address	3.1.120.89

Parameter Name	Description
statusCode	Status Code. Refer here
status	Outcome of the request (Processing, Succesful, Failed)
account	Account Number
product	Product Code
amount	Amount
sn	Serial number/identifier generated from the provider/operator
pin	Pin number for vouchers, gift cards, etc
expiry	Expiration date of the voucher (yyyymmdd)
cost	The price paid for the product
remarks	Any additional comments or notes about the transaction
refid	Unique reference ID for tracking this specific transaction
timestamp	The timestamp of this transaction
note	Important instructions or information for the user regarding the product
voucherlink	A web link to access or redeem the voucher

Sample HTTP POST Callback

json

{
  "data": {
    "statusCode": 20,
    "status": "Succesful",
    "account": "0123456789",
    "product": "GC",
    "productName": "Grab Gift Code",
    "amount": 5,
    "sn": "106648697",
    "pin": "MPHE39G3WL",
    "expiry": "20251116",
    "cost": 5,
    "balance": 50.54,
    "remarks": "",
    "refid": "321479-0-30f4f209-ee",
    "timestamp": "2025-05-20 13:09:34",
    "note": "Insert voucher code into Use Grab Gifts under Use Offers section upon check out",
    "voucherlink": "https://api.grab.com/gifts/v2/go?id=7464957319334bb0afbd5980738a2b50"
  }
}

Sample HTTP GET Callback

html

https://yourdomain.com?refid=1234t&status=48&price=9.73&message=%7B%22statusCode%22%3A48%2C%22status%22%3A%22Failed%22%2C%22account%22%3A%220123456789%22%2C%22product%22%3A%22C%22%2C%22amount%22%3A10%2C%22sn%22%3A%22%22%2C%22pin%22%3A%22%22%2C%22expiry%22%3A%22%22%2C%22cost%22%3A9.73%2C%22remarks%22%3A%22HC%22%2C%22refid%22%3A%221234t%22%2C%22timestamp%22%3A%222025-05-21+14%3A29%3A31.710%22%2C%22note%22%3A%22%22%2C%22voucherlink%22%3A%22%22%7D

Sample Callback Response ​

Sample Callback Response