In July 2025, Michael Whelehan enhanced the spring-projects/spring-authorization-server by implementing a feature that returns and persists the client_secret_expires_at timestamp during client registration. He approached the task by updating backend logic in Java, leveraging Spring Security and OAuth2/OIDC standards to ensure the expiration timestamp is accurately included in registration responses and reliably stored. Comprehensive tests were added to verify the persistence and correctness of the expiration date across registration flows. This work improved client lifecycle visibility and supported better secret rotation practices, reflecting a focused and well-executed contribution to secure backend development within the project’s codebase.