组装成如下格式{"appId":"xxxx","nonceStr":"s8F5h5r3JA5lAc3c","package":"prepay_id=wx2410033394517472a6fefd726d364d0000","sign":"9C9D8BC1FBDC3DED0FBD0D6AB1B429","signType":"MD5","timeStamp":"1603505015"} 提示验签失败, 签名的key 是统一的吗? 还是小程序有一个独立的 key?

错误信息 如下: requestPayment:fail errors 第一次调用WXPayUtil.generateSignedXml(data, key) 生成xml 然后调用 返回prepayid 后, 第二次调用WXPayUtil.generateSignature(key) 生产签名, 最后组装如下 {"appid":"xxxxx","noncestr":"iRo7V69fhB3LmcaG","package":"Sign=WXPay","partnerid":"xxxx","prepayid":"wx2214310646xxx11649cc191df2dafff40000","sign":"E6C961207A3ACD9F92D85B2B784E795B","timestamp":"1603348326284"} 然后这样传给uni app 报错;