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{"BuyerLogonId":null,"BuyerUserId":null,"FundChange":null,"GmtRefundPay":null,"OpenId":null,"OutTradeNo":null,"RefundDetailItemList":null,"RefundFee":null,"SendBackFee":null,"StoreName":null,"TradeNo":null,"Code":"40002","Msg":"Invalid Arguments","SubCode":"isv.invalid-signature","SubMsg":"无效签名","Body":"{\"alipay_trade_refund_response\":{\"code\":\"40002\",\"msg\":\"Invalid Arguments\",\"sub_code\":\"isv.invalid-signature\",\"sub_msg\":\"无效签名\"},\"sign\":\"aUududgICSy=\"}","IsError":true}
String serverUrl = "https://mapi.alipay.com/gateway.do?";
String app_id = "2016072701671...";
String merchant_private_key = "MIICXAIBAAKBgQDzU21CqEikiAWy4rbixd8fsB...";
String alipay_public_key = "MIGfMA0GCSqGSIb3DQEBAQUAA4GN...";
String out_trade_no = "AP160825000009";
String trade_no = "2016082521001003690234365...";
String charset = "utf-8";
String sign_type = "RSA";
String version = "1.0";