# Welcome to the OAuth2 Authentication Service Provider Documentation!
The 4App OAuth2 Authentication Service Provider allows 4ALLPORTAL users to log in via OAuth2 providers such as Facebook, Google, GitHub or Keycloak. We currently support the following OAuth2 providers:
- Facebook configuration guide
- Google configuration guide
- GitHub configuration guide
- Keycloak configuration guide
After installation, you will find new admin snap-in Authentication/OAuth Configurations
to configure an OAuth2 provider:
# Supported Core Engine Versions
- The 4App OAuth2 Authentication Service Provider is supported starting from Core Engine version 3.8.
- From 4App version 2.0, 4App Core Engine 4.2 or higher is required.