@kubikpixel Aral wrote positively about Stripe. Aparently their docu of their API is quite good (and even dynamic). You could ask him :-)
Crypto could also be a possibility, lol. I think I wouldn't want to deal with cashouts, but I need to pay for something with crypto anyway, so... It's a can of worms that I generally wouldn't recommend otherwise (also, worms aren't suitable for vegans). I guess it's saying that this disclaimer is the longest part of my reply 😇
(To the cops reading this, I'm law-abiding citizen who never bought something illegal. 😇 Also kindly fuck off.)