https://news.ycombinator.com/item?id=17905919
The consensus is that the Stripe and Auth0 are good:

• Stripe: https://stripe.com/docs/api
• Auth0: https://auth0.com/docs/api/authentication

I still find them to be quite complex for a complete beginner.
I think we can do much better. 💭