3D Secure is automatically enabled on your card and no action is required on your side.
How much does 3D Secure cost?
3D Secure costs nothing. This service is free.
I have more than one card. Do I need to register all my cards separately?
This is not needed as 3D Secure is automatically enabled on all your cards.
I have just received a new card. Do I need to register it to use 3D Secure?
This is not needed as your new card is already 3D Secure-enabled.