How to close a transaction with whitelabel discount coupon

{  
	"webhook": "postback",
	"timestamp": "2019-07-01 15:00:00",
	"data": {
	    "transactionId": "ABCDEFGHIJK1234567890000000147852369123",
	    "status": "approved",
	    "date": "2019-07-01 14:00:00"
	}
}

{  
	"webhook": "postback",
	"timestamp": "2019-07-01 15:00:00",
	"data": {
	    "transactionId": "ABCDEFGHIJK123456789000000014785236912",
	    "status": "approved",
	    "date": "2019-07-01 14:00:00"
	}
}