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地址：https://gateway.test.95516.com/gateway/api/backTransReq.do
请求：version=5.1.0&encoding=utf-8&txnType=01&txnSubType=06&bizType=000000&backUrl=https%3A%2F%2Fplatform.dayuanfashi.cn%2Faddons%2Fyk_parkinglot%2Funionpay%2FBackReceive.php&signMethod=01&channelType=08&accessType=0&currencyCode=156&merId=&orderId=20250627095714&txnTime=20250627095714&txnAmt=1&termId=12345678&qrNo=6220000833830809232&reqReserved=eyJ1bmlhY2lkIjoyLCJvaWQiOiIyMDI1MDYyNzA5NTcxNCJ9&certId=
应答：Invalid request.=
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应答报文验签失败