those online buyer whoever is using credit card that enrolled 3D Security, i.e. Verified by Visa™ (VbV) or MasterCard SecureCode™. During the transaction, their browser will be redirect to their credit card issuer bank related website and are requested to provide a security password / 3D PIN within a given timeframe in order to authorize and proceed with the transaction. Fail to do
so will cause the failure in this transaction.

What is 3-D secure™?
3-D Secure™ is a card holder authentication mechanism. Every card entered in the
payment gateway is checked by the respective card association, i.e. MasterCard or VISA.
It is verified whether or not user authentication is required for the given card. If yes, the
card holder is redirected to the issuer bank’s system to identify himself (by entering a
password, inserting a chip card providing other sensitive information). The result of the
authentication is then handed back to the payment gateway.

Kindly contact your issuer bank if you still problem in using your card online.