Hi,
From ZIP file, we've been able to get stripe SCA / 3DS payments after going and updating your code. Also, we've updated Stripe API to latest v7.128.0 and Stripe Checkout too.
BF Legacy code API looks like v3.6.0, so old...
As we don't have in depth BF coding documentation, it takes time to debug, to get BF coding understanding. We are still testing with sample of customers, and improving our code.
If you'd like, we could share our implementation with your engeneering team, so it may speed up a real implementation in BF APPS. These are "new" European payment rules since two years.
Best regards, Gil