根据https://pay.weixin.qq.com/wiki/doc/apiv3/wxpay/pay/combine/chapter3_2.shtml 这个文档,开发合单支付严格按照文档要求进行签名,但是返回的结果始终是如下,按照https://wechatpay-api.gitbook.io/wechatpay-api-v3/chang-jian-wen-ti/qian-ming-xiang-guan 该文档,签名失败也没有提供detail的细节说明.

如下是返回的错误信息,包含header头信息

"HTTP\/1.1 401 Unauthorized\r\nServer: nginx\r\nDate: Sun, 05 Apr 2020 04:27:15 GMT\r\nContent-Type: application\/json; charset=utf-8\r\nContent-Length: 67\r\nConnection: keep-alive\r\nKeep-Alive: timeout=8\r\nCache-Control: no-cache, must-revalidate\r\nX-Content-Type-Options: nosniff\r\nRequest-ID: 2pu3so\r\n\r\n{\"code\":\"SIGN_ERROR\",\"message\":\"验签失败，请检查签名\\t\"}\n"

请问一下 合单下单-JS支付API的 签名是怎样的.

我的签名规则如下

$url = 'https://api.mch.weixin.qq.com/v3/combine-transactions/jsapi';

  $timestamp = time();

        $nonce = $this->nonce_str();

  $datas = json_encode($params);

        $sign = $this->sign1($url, 'POST', $timestamp, $nonce, $datas , $this->mch_private_key, $this->mch_id, $this->serial_no);

        // echo(mb_strlen(' WECHATPAY2-SHA256-RSA2048 ' . $sign,"utf-8"));

        //设置header头

        $header = [

            'Authorization: WECHATPAY2-SHA256-RSA2048 ' . $sign,

            'Accept:application/json',

            'User-Agent:' . $this->mch_id,

            'Content-Type:application/json',

           'Wechatpay-Serial:' . $zhengshu

        ];

签名的函数如下

   public function sign1($url, $http_method, $timestamp, $nonce, $bodya, $mch_private_key, $merchant_id, $serial_no)

    {

        $url_parts = parse_url($url);

        $canonical_url = ($url_parts['path'] . (!empty($url_parts['query']) ? "?${url_parts['query']}" : ""));

        $message =

            $http_method . "\n" .

            $canonical_url . "\n" .

            $timestamp . "\n" .

            $nonce . "\n" .

            $bodya . "\n";

        openssl_sign($message, $raw_sign, $mch_private_key, 'sha256WithRSAEncryption');

        $sign = base64_encode($raw_sign);

        $schema = 'WECHATPAY2-SHA256-RSA2048 ';

        $token = sprintf(

            'mchid="%s",nonce_str="%s",signature="%s",timestamp="%d",serial_no="%s"',

            $merchant_id,

            $nonce,

            $sign,

            $timestamp,

            $serial_no,

            $bodya

        );

        // echo($token);

        return $token;

    }

这个函数也是微信官方文档提供的函数,请教各位大神,怎样解决问题