{"status":"ok","service":"ClassCheck API","version":"4.0","description":"QR Attendance Verification API","endpoints":{"GET /":"This info","GET /health":"Health check with Redis status","GET /debug":"Debug info (active sessions)","POST /verify":"Verify QR code attendance","POST /sync/start-session":"Start attendance session","GET /attendance/:schedule_id":"Get attendance for a class"},"documentation":"https://classcheck.cloud/docs"}