'Authentication and Subscription in Web Application Best Practice

I have an application with Angular in frontend and NodeJs as a Backend.

I want to add a Login/Authentication and Subribtions/Payments to the app and wondering what is the best and easiest solution today. I read about services like Memberstack!?

I also worked with OpenId before and know that some cloud provider got their own solutions.

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'Authentication and Subscription in Web Application Best Practice

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