Stripe is easy and straightforward, though their subscription messaging stuff is less well documented than I'd like. Their "typical workflows" aren't as typica

Stripe is easy and straightforward, though their subscription messaging stuff is less well documented than I'd like. Their "typical workflows" aren't as typical as I would have expected, and presume a level of integration with Stripe that isn't a given. But for its core value prop, payment processing, it's great. You can work around the rest.