If you have obtained the credit card from HDFC, the process is simple. You can log in to your net banking account and under pay bill section, you can add your credit card.
If you have a non-HDFC credit card, you can make your payments from your HDFC account by registering your credit card at the third-party transfer.
Go to http://hdfcbank.com site…
login, go to credit cards window… select Register my card
answer simple question like pin of the card…
registration is done and it will be visible in app too.