Worked on the binarywang/WxJava repository to implement enterprise WeChat group callback support by extending the WxCpXmlMessage class with LastMemVer and CurMemVer fields. This addition enabled the retrieval of group member version information, enhancing the API’s data surface for enterprise clients. The solution leveraged Java for backend development and utilized XStream for XML parsing and aliasing, ensuring accurate and maintainable XML-to-object mapping. By focusing on API integration and robust XML handling, the work delivered a reliable, testable feature that improved data fidelity and integration reliability for enterprise WeChat group callback events within the WxJava codebase during the project period.