Rails. Django. Asp.Net Core. Spring. Laravel. All those frameworks handle that stuff trivially. Why are you trying to do it with a static site? Serverless? No

Rails. Django. Asp.Net Core. Spring. Laravel. All those frameworks handle that stuff trivially. Why are you trying to do it with a static site? Serverless? Node? You're massively over-complicating it. There are even open-source template applications for most of those frameworks that already have customer and stripe supscriptions baked in.