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Re:The rise of the one-person unicorn by cspags on Sunday August 15, 2021 @12:49PM (#28190251)
https://www.outseta.com/ is the best tool I've seen that offers everything you listed.
Re:The rise of the one-person unicorn by valenterry on Sunday August 15, 2021 @07:42PM (#28193602)
Wow! That's it!

It just looks like they are offering there services mostly for non-developers (low-code / no-code) and I couldn't find anything about whether they have an API that I can use from my own code to check for registered users and if they paid etc.

EDIT: nevermind, found it: https://documenter.getpostman.com/view/3613332/outseta-rest-...