Reference
Remy Reference/interface/auth.handleRemyRedirect
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auth.handleRemyRedirect

Complete a delegated sign-in on page load; call it once on mount.
auth.handleRemyRedirect() → Promise<AppUser | null>

Handles the return from both the "Continue with Remy" redirect and a direct open from the Remy dashboard. On success it updates the session in place and cleans the URL. A no-op when there is nothing to redeem.

Usage
useEffect(() => { auth.handleRemyRedirect().catch(() => {}); }, []);