Problem is it still requires an API to integrate. Stripe has all these capabilities but API integrations are needed to use them. If you are looking to build a micro SaaS without needing to deal with billing API integrations check out our software: https://saasbox.net. Built for completely eliminating any billing related SW development. It doesn't handle all the corner cases mentioned in the article, but some of them are handled, such as plan upgrade / downgrades with pro-rating, editing plans on the fly, migrating users across plans, notifying your application on those changes.
My understanding is that Stripe billing can be managed completely no-code from the Stripe dashboard? And I think it includes automatic tax, prorations etc.
