| 4000000000003220 | Required | 3D Secure 2 authentication must be completed for the payment to be successful. Use this card to test that your integration is ready to supportStrong Customer Authentication requirements in Europe. By default, your Radar rules will request 3D Secure 2 authentication for this card. |
| 4000000000003063 | Required | 3D Secure authentication must be completed for the payment to be successful. By default, your Radar rules will request 3D Secure authentication for this card. |
| 4000008400001629 | Required | 3D Secure authentication is required, but payments will be declined with a card_declined failure code after authentication. By default, your Radar rules will request 3D Secure authentication for this card. |
| 4000000000003055 | Supported | 3D Secure authentication may still be performed, but is not required. By default, your Radar rules will not request 3D Secure authentication for this card. |
| 4242424242424242 | Supported | 3D Secure is supported for this card, but this card is not enrolled in 3D Secure. This means that if 3D Secure is requested by your Radar rules, the customer will not go through additional authentication. By default, your Radar rules will not request 3D Secure authentication for this card. |
| 378282246310005 | Not supported | 3D Secure is not supported on this card and cannot be invoked. The PaymentIntent will proceed without performing authentication. |