Distributed Exam Proctoring Verification Microservice

Design a distributed PHP microservice architecture for remote exam proctoring and identity verification. Create secure, stateless authentication endpoints that can validate student identity using multi-factor authentication, including biometric facial recognition, keystroke dynamics, and browser fingerprinting. Implement rate limiting, anomaly detection, and real-time monitoring to prevent cheating attempts. Develop webhook integrations that can communicate suspicious activities to central monitoring systems with cryptographically signed event logs.