微信小程序红包，提示签名错误，用的官方SDK,是设置问题吗？
WxPayConfig payConfig = new WxPayConfig();
payConfig.setMchId(merchantId);
payConfig.setApiV3Key(v3Key);
payConfig.setAppId("wxf2aafca43551b0b5");
payConfig.setCertSerialNo(merchantSerialNumber);
payConfig.setKeyPath(apiclient_cert);
payConfig.setPrivateCertPath(wechatPayCertificatePath);
payConfig.setPrivateKeyPath(privateKeyPath);
WxPayService wxPayService = new WxPayServiceImpl();
wxPayService.setConfig(payConfig);
RedpackService redpackService = wxPayService.getRedpackService();
请求 <xml> <mch_id>125***********</mch_id> <nonce_str>12332***********</nonce_str> <sign>FB2D8A3D1221***********</sign> <mch_billno>1000009820***********</mch_billno> <send_name>hbfc</send_name> <re_openid>oUJ9Y5UDlw***********</re_openid> <total_amount>1</total_amount> <total_num>1</total_num> <wishing>wishing</wishing> <act_name>qhb</act_name> <remark>remark</remark> <notify_way>MINI_PROGRAM_JSAPI</notify_way> <wxappid>wxf2aafca43551b0b5</wxappid> </xml> 响应 返回代码：SUCCESS，返回信息：签名错误，结果代码：FAIL，错误代码：SIGN_ERROR，错误详情：签名错误 appId wxf2aafca43551b0b5