{"alipay_trade_close_response":{"code":"40002","msg":"Invalid Arguments","sub_code":"isv.invalid-signature","sub_msg":"验签出错，建议检查签名字符串或签名私钥与应用公钥是否匹配，网关生成的验签字符串为：alipay_sdk=alipay-sdk-net-4.9.401.ALL&app_id=2021005116613153&biz_content={"trade_no":"2025031822001467391408970664"}&charset=UTF-8&format=json&method=alipay.trade.close&sign_type=RSA2×tamp=2026-03-07 10:17:11&version=1.0"},"sign":"cRkeFXHOgph03Yo2Cr3YkyCYGgZfLwNe6vY881G4aUtJMMHoIHd2klXWAo5MLXNfakGhxLCmPZcJ20DUGXV5auwv3qNG5dXqmPWAgXkze5tXzkDFlbGBrOHibnRtLUYSKIxNRIiDV5mCyGpBMe77JJaxOdkUZy/hEZ84LB2OhPKE1Jaeqj+Gi1MRewwdiQGQXkao0QmVJ2rncgWKvHBOMSrn19JFbDZBghVlr0rrM/nMGu9AnQa+QvlL60CJ+PwV2ueTmIoiKgmEyJ4oTv9pTnl1vvbTN9IKt52aeY0XzSydiIEv5QJyrtdRAt4cch/f+9w8kbEOWK73p9dNbopDeg=="}