Are you planning to support saved payment methods across multiple providers? Thats always seemed like the touchiest area for me, especially since it would seemingly invalidate a lot of the fraud protection that payment providers use to keep lock-in.
We're PCI compliant so can use saved payment methods across multiple providers, however in our case it does not invalidate the built-in fraud protection that providers use. Additionally, you could also use third party fraud providers at any point within your processing flow.
> however in our case it does not invalidate the built-in fraud protection that providers use
Thats pretty neat! Even Stripe Radar? My understanding was that used their client side fingerprinting when the card is inputted, but its been a little bit.