System
Authentication Service
Send Magic Link
POST /send - Request a magic link authentication email
Verify Magic Link
GET /letter - Verify token from email
Exchange Token
POST /auth/exchange - Exchange device token for session
Refresh Device Token
POST /refresh-device - Refresh session using device token
Validate Session
GET /session - Validate current session and get user info
Sign Out
POST /signout - Sign out current session only
Sign Out All
POST /signout-all - Sign out all sessions and revoke tokens