Do it by hand

Authenticate Users
- Redirect users to login - Authorization Code flow
- Re-authenticate users with push notifications - CIBA flow
Session Management
- Keep your users logged in - Refresh Token flow
- Logout your users - Logout
- Get users' profile - Userinfo
- Revoke access_tokens - Token revocation
Access APIs
- Validate Access Tokens - Token Introspection
Access application data
- Client credentials