Ask HN: Recommended user authentication/management provider with paid accounts?

I'm wondering what people recommend these days for a third party user management system - signing up, confirming email, signing in, password resets etc. But specifically one that supports paid end user accounts so also operates as a merchant or a payment processor.

In other words, a typical third party auth like UserFront etc but one where that same third party auth provider will also take payments from my users as well. (And not just a payment provider that does subscriptions, as they'd be expected to support the complete day to day site user flows in addition to taking payments.)

In an ideal world all my server would ever need to do to support users and payments is something like grabbing a JWT from a cookie, validating it, and looking at the paid flag.

Is there a single provider you'd suggest for this? Or is it too many eggs in one (single point of failure) basket and you'd suggest separate services for the auth flows and the subscription payments - albeit ones which happen to work well together?