We’re pretty serious about the security of your card information. 3D-Secure is one of the non-negotiables mandated by the Cards Association. It makes online transactions more secure by checking that the person using the card, owns it. So no sneaky stuff.
3D-Secure requests information after the card has been loaded for payment that only the cardholder would know like the OTP, etc.
For the lowdown on 3D-Secure, you can take a look at this article here.