You can pay for any card as they have BBPS system at Rewardz site also. So just choose your bank. Enter mobile number and last 4 digits. Enter amount which should not be more than available pts like for 20K pts max you can enter is 5000 amount or below. Above this you wont be able to pay from any other method like Internet banking or DC. If you have 1000 pts, enter amount 250 only.