This page demonstrates Stripe's sources API for 3D Secure payments.
Processing...
| 4242424242424242 | 3D Secure authentication not supported, but will charge successfully |
| 4000000000003055 | 3D Secure authentication supported, will go through the full 3D Secure flow |
| 4000000000003063 | 3D Secure authentication required, charge will be declined without it |