"On 14 September 2019, a new European regulatory requirement called Strong Customer Authentication (SCA) will introduce two-factor authentication requirements for many online payments in Europe. We expect this regulation to be enforced in the UK regardless of the outcome of Brexit. Payments that aren’t authenticated will be declined by your customers’ banks.

We’ve released a new payments API and SCA-ready products to help you prepare for this change. To get ready for these new rules and avoid having many European payments declined, you’ll need to make changes to your payment flows and Stripe integration by 14 September 2019. Read our docs to learn more about SCA and the required changes."