Hi,
What:
Why should a user not select his/her own Account Number and Debit card numbers?
Why:
This will be very easy for the users to remember these numbers.
How:
Maybe Jupiter can provide a set of numbers based on user DOB, PAN and Mobile number combination or any other combination for the users to choose from. You can charge extra for those users who are willing to avail this option.
Cheers,
Raghavendar S