Contributed to the spring-projects/spring-authorization-server repository by implementing POST support for the OAuth2 Authorization Code flow, expanding request handling beyond the traditional GET method. This enhancement improved client compatibility and interoperability for OAuth2 deployments by allowing authorization requests to be submitted via POST, addressing broader integration scenarios. The work involved backend development using Java and the Spring Framework, with a focus on aligning with repository standards and preparing the codebase for future enhancements. No major bugs were addressed during this period, and the contribution demonstrated a strong understanding of OAuth2 protocols and Spring Security within a collaborative, standards-driven environment.