我使用wechatpay-php开发 商户订单号查询订单 代码如下： // 设置参数 // 商户号 $merchantId = 'XXXX98216'; // 从本地文件中加载「商户API私钥」，「商户API私钥」会用来生成请求的签名 //file_get_contents是自己加的 $merchantPrivateKeyFilePath = file_get_contents('E:\fund\apiclient_key.pem'); $merchantPrivateKeyInstance = Rsa::from($merchantPrivateKeyFilePath, Rsa::KEY_TYPE_PRIVATE); // 「商户API证书」的「证书序列号」 $merchantCertificateSerial = 'XXXX4CBC872A7C76329583239D3'; // 从本地文件中加载「微信支付平台证书」，用来验证微信支付应答的签名 $platformCertificateFilePath = file_get_contents('E:\fund\vendor\wechatpay\wechatpay\wechatXXXF3AB3FDFEA4696E95432A9BCD3D7.pem'); $platformPublicKeyInstance = Rsa::from($platformCertificateFilePath, Rsa::KEY_TYPE_PUBLIC); // 从「微信支付平台证书」中获取「证书序列号」 $platformCertificateSerial = PemUtil::parseCertificateSerialNo($platformCertificateFilePath); // 构造一个 APIv3 客户端实例 $instance = Builder::factory([ 'mchid' => $merchantId, 'serial' => $merchantCertificateSerial, 'privateKey' => $merchantPrivateKeyInstance, 'certs' => [ $platformCertificateSerial => $platformPublicKeyInstance, ], ]); try { // 打印订单号，确保其正确性 echo "out_trade_no: " . $out_trade_no . PHP_EOL; $resp = $instance ->chain("v3/pay/transactions/out-trade-no/$out_trade_no") ->get(['query' => [ 'mchid' => $merchantId, ]]); echo $resp->getStatusCode(), PHP_EOL; echo $resp->getBody(), PHP_EOL; return $resp->getBody(); } catch (\Exception $e) { // 进行错误处理 echo $e->getMessage(), PHP_EOL; if ($e instanceof \GuzzleHttp\Exception\RequestException && $e->hasResponse()) { $r = $e->getResponse(); echo $r->getStatusCode() . ' ' . $r->getReasonPhrase(), PHP_EOL; echo $r->getBody(), PHP_EOL, PHP_EOL, PHP_EOL; } echo $e->getTraceAsString(), PHP_EOL; } 报错： out_trade_no: O7291660515080d1722216605 Client error: `GET https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/-o7291660515080d1722216605?mchid=1682098216` resulted in a `404 Not Found` response: {"code":"ORDER_NOT_EXIST","message":"订单不存在"} 为啥订单前面非要自动加-