Paperform's Stripe integration comes with dynamic 3D Secure support. This means that if a credit card that is used that requires 3D Secure to be processed, then Paperform will automatically use 3D Secure.
How do I always use 3D Secure?
You can optionally require all credit card payments use 3D secure by setting up 3D Secure Radar rules in Stripe.
For more information, see https://stripe.com/docs/payments/3d-secure#three-ds-radar