During March 2025, Xiaoxifeng focused on backend development and API integration within the binarywang/WxJava repository, specifically targeting the WeChat Mini Program’s immediate delivery service. Xiaoxifeng identified and resolved a critical bug in the waybill goods update flow, correcting the API endpoint to ensure accurate logistics updates. Working primarily with Java, Xiaoxifeng emphasized reliability and maintainability by stabilizing existing APIs and preventing potential regressions. Although no new features were introduced during this period, the work demonstrated a methodical approach to improving system stability, with careful attention to endpoint resolution and integration details in a production environment for delivery services.