This is an example of a basic Stripe integration that uses 3D Secure to authenticate the cardholder, with a Python backend.
You can deploy this for free on Heroku:
Note that at the moment, 3D Secure is still a beta feature and not available for all accounts. In order to test this feature, you'll need to be invited to partipicate to the beta. If this sounds like something you'd be interested in, please reach to Stripe support.