{"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=2026-01-17 20:43:36&version=1.0"},"sign":"KiqIkB9N34gXmCPGZ7tfn4Xx+4y5wPe/g7N9hav41F0OVLVarypK76SMT7LpN00lXgTdhzX9qhbVZ+i/v/XVWX+LGBWtsQmAZEM1Yqu3Kk9kyIYWfqtmiMr4bu+CwK705UzwWVY8puFrr0bktimvKuYPvHPC4bDVAPSpeYTKWmd0NVUSnJgEhJN1RYH5YS9pYBV3lGm0JhJVTn0Ao2ZeIN97Yvh6IDMHKRONg3eUvI6dNkLnhsQ0QHKjfLrb3ZeqOqZbRyTuId5v27B/qrA8V+V491PCq3Yb8PDqw67g89CKmoi/2p6iTr5jeC/XNSIoScuTPVb1W47xIKLiESxSCg=="}