Question: how to pay hdfc credit card bill through pnb debit card?
Answer: Log in to netbanking of the bank you have an account with.
Make a NEFT payment towards your credit card bill. ... 
If you are using a Diners Club card, add prefix 00 to your 14 digit card number.
Enter 'HDFC0000128' as the IFSC code for transferring money to pay your HDFC credit card bill.