/add-social-login

Implement OAuth social login with Google, GitHub, and Microsoft. Set up OAuth applications in provider developer consoles. Create authentication flow with authorization code grant. Implement callback handling for OAuth redirect. Store user profile information (name, email, avatar) in database. Add account linking to merge social and email accounts. Handle authentication errors gracefully with user-friendly messages. Implement CSRF protection with state parameter. Add logout functionality clearing all sessions. Store OAuth tokens securely with encryption. Support multiple social accounts per user. Create user profile page showing connected accounts. Reference authentication-agent for security best practices. Test OAuth flow in development with test accounts.