//获取私钥
public function getPrivateKey()
{
    //绝对路径 $this->apiclient_cert
    $this->apiclient_cert = file_get_contents($this->apiclient_cert);//获取私钥
}

/**
 * 生成签名
 */
protected function getSign()
{
    $url_parts = parse_url($this->url);  //链接
    $canonical_url = ($url_parts['path'] . (!empty($url_parts['query']) ? "?${url_parts['query']}" : ""));
    $this->timestamp = time();
    $this->nonce_str = createKey(); //随机字符串
    $message =
        "POST\n" .
        $canonical_url . "\n" .
        $this->timestamp . "\n" .
        $this->nonce_str . "\n" .
        $this->body . "\n";
    $this->getPrivateKey();  //生成私钥
    openssl_sign($message, $raw_sign, $this->apiclient_cert, 'sha256WithRSAEncryption');
    $this->sign = base64_encode($raw_sign);
}
raw_sign 这个参数是什么意思提示Authorization不合法因为签名没有生成

https://wechatpay-api.gitbook.io/wechatpay-api-v3/你好，V3签名参考这篇文档。

是说V3版代金券创建吗？V3版签名是在请求头HEADER，请求体是纯数据。