cURL with WordPress

Hi
I need to use payment script in wordpress . it is using from cURL.
when I copy code in template page in wordpress , page is locked and curl_exec() doesn’t work . how to fix it ?

my code :

$ch = curl_init();
curl_setopt($ch, CURLOPT_USERAGENT, '"Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)');
curl_setopt($ch, CURLOPT_URL,$API_Endpoint);
curl_setopt($ch, CURLOPT_VERBOSE, 1);

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);

curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_POST, 1);

if(USE_PROXY)
curl_setopt ($ch, CURLOPT_PROXY, PROXY_HOST.":".PROXY_PORT); 

if(strlen(str_replace('VERSION=', '', strtoupper($nvpStr))) == strlen($nvpStr)) {
$nvpStr = "&VERSION=" . urlencode($version) . $nvpStr;
}

$nvpreq="METHOD=".urlencode($methodName).$nvpStr;
curl_setopt($ch,CURLOPT_POSTFIELDS,$nvpreq);
$response = curl_exec($ch);

I tested it . Page is locked in below line :
$response = curl_exec($ch);