Optional session identifier to incorporate into the OAuth state string.
When provided, the state becomes <sessionId>:<random-uuid>, preventing
parallel login flows from different browser tabs or user-agents from
overwriting each other's PKCE state.
Example
// Scope login to the current user session constsessionId = req.cookies["session_id"]; const { url, state } = awaitscAuth.initLogin({ sessionId });
Options for SCAuthManager.initLogin.