Passwords and refresh tokens go only to the system keychain; a refused keychain keeps them in memory until exit and says why. Gmail and Microsoft sign in by authorization code with S256 PKCE on a loopback redirect; refresh tokens are kept, and revoked grants ask to sign in again. Client IDs come from the build (env or oauth.env). ureq trace records never reach the log. Co-Authored-By: Claude <noreply@anthropic.com>