Retrieve Session Response

Retrieve the cached webhook payload for an authentication session using sessionId.
This is useful when your backend receives or tracks a session and later needs to fetch the same auth-init payload (challenge + redirect metadata) in a pull-based way.

Example auth URL with session id:
https://auth.blockpeer.finance/auth?sessionId=f07aa200-a027-4e13-9142-2f0e897a7eea
From this URL, the sessionId is:
f07aa200-a027-4e13-9142-2f0e897a7eea

Quick Integration Notes

• Call this endpoint when your client/MCP flow needs latest cached response for a session.
• Always store sessionId from earlier auth/register initiation APIs.
• Handle 404 as expired/invalid session and restart the relevant auth flow if needed.