I have an SC card and a HDFC one.
My bank account is in HDFC.
Till date I always used to shop with HDFC card and used to pay the balance using HDFC netbanking.
Last night I made a purchase using SC card.
Now I have no idea how to pay it off.
I just have an SC card for no reason.
Cam I add this card to my netbanking or will I have to go to bank and stuff. 
I hate if there is paperwork involved somewhere.
Netbanking ---- credit card payment---- un registered card payment .
I tried doing they. But it said invalid something.
Its very simple, no need to add anything. Go to SC bank site, go into Cc section and look for pay credit card bill. From there you can pay your cc bill with any bank account.
Else just put a cheque in drop box.
You can pay from the Standard Chartered Site itself.
I also do the same since i have a HDFC bank account an used to pay the CC bills online.
use the following link to make payment.
Thank you. That would solve the problem.