I request you please don’t rely on NG Pay. I had booked a ticket using this and when I cancelled the same ticket I have not been refunded yet. When I try to call them they told me It will take time and cannot tell you how much time it will take. It has been around a month and I have still not received refund amount of Rs. 3000. Moreover, it has no use in Booking tatkal because when you will try to use it it will show communication error.
I suggest please use only IRCTC Website. It is the only good thing to book your tickets