What is 3D Secure? I am trying to pay with my CC, but it says "3D Authentication failed".

3D Secure authentication

3D Secure (3-domain structure), also known as a payer authentication, is a security protocol that helps to prevent fraud in online credit and debit card transactions. One of the advantages of 3D Secure is that it reduces fraud. It also makes shopping/commerce safer online.

If you receive a "3D Authentication failed" error - it means that you were not successful entering required information. Please correct any typing errors, deactivate Caps Lock, check the data if needed and try one more time.

If the error remains - contact your credit card issuing bank for additional information.