Php PAYPAL PDT IIS服务器

我用这个作为我的paypal的pdt

当我上传到我的IIS服务器时，这不起作用。我是否遗漏了什么

     $pp_hostname = "www.sandbox.paypal.com"; 
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, "https://$pp_hostname/cgi-bin/webscr");
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
    //set cacert.pem verisign certificate path in curl using 'CURLOPT_CAINFO' field here,
    //if your server does not bundled with default verisign certificates.
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array("Host: $pp_hostname"));
    $res = curl_exec($ch);
    curl_close($ch);

    if(!$res)
    {
        echo "HTTP ERROR";
    }else
    {
          //my code here
    }

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我想出来了。我下载了cacert.pem并添加了它..而且它很有效 !

定义不起作用。我们不是读心术的人。