Worked on the keycloak/keycloak repository to address a security issue in token issuance, focusing on backend development and API security using Java. Fixed a bug where authorization details were incorrectly included in token responses by implementing flow-type based validation, ensuring that such details are present only for appropriate token issuance flows. This approach reduced the risk of data leakage and improved the correctness of token responses, aligning with security requirements. The work was tracked through a signed-off commit and linked to the relevant issue for traceability. Demonstrated attention to secure API development and robust backend practices within a collaborative environment.