How to make an independent authorization system?

Question

API

Hello.
I am working on a project that will eventually expand into several projects, such as: Proj Film, Proj Music. These are all separate sites. But a single system of profiles.
The architecture will look something like this:
user.site.ru
film.site.ru
music.site.ru
For all this, you need to make a button "Log in with Proj" (analogous to all other OAuth systems).
The entire product is based on Strapi.
Please tell me which technology is best to use here.
Perhaps there are ready-made solutions?

Answer 1

Try this
docs.identityserver.io/en/latest