Firstly you have to go to home page of HDFC bank

Then select Verified by Visa/ MasterCard SecureCode/ Netsafe/ RuPay PaySecure option from the following option and click on login.

• NetBanking
• Prepaid/ Forex Card
• Verified by Visa/ MasterCard SecureCode/ Netsafe/ RuPay PaySecure
• Credit Card Login
  (if you do not hold HDFC Bank account)

Than you will be redirected to page as shown below.

Now click on Register link given on right side of the page

Then select HDFC Bank Master / Visa Credit Card Gateway in Bank Information in Aam Aadmi Tatkal.

Now enter your Netsafe passward and select the option of Verified by Visa Passward and .

Then it will not ask for OTP at the time of payment.