cURL POST to REST Service

[rrr2001]

I am trying to post to a REST service using PHP cURL but I'm after running into a bit of difficulty (this being that I've never used cURL before!!). I've put together this code:\[code\] <?phperror_reporting(E_ALL);if ($result == "00"){$url = 'http://127.0.0.1/xxxxxx/AccountCreator.ashx'; /*I've tried it a combination of ways just to see which might work */$curl_post_data = http://stackoverflow.com/questions/3802277/array('companyName' =>urlencode($companyName), 'mainContact' =>urlencode($mainContact), 'telephone1' =>urlencode($telephone1), 'email' => urlencode($email), 'contact2' => urlencode($contact2), 'telephone2' => urlencode($telephone2) 'email2' => urlencode($email2); 'package' => urlencode($package) );foreach($curl_post_data as $key=>$value) {$fields_string .=$key. '=' .$value.'&';}rtrim($fields_string, '&');die("Test: ".$fields_string);$ch = curl_init();curl_setopt ($ch, CURLOPT, $url);curl_setopt ($ch, CURLOPT_POST, count($curl_post_data));curl_setopt ($ch, CURLOPT_POSTFIELDS, $fields_string);$result = curl_exec($ch);curl_close($ch);\[/code\]Following this, my code sends an email and performs an IF statement. I know this works okay, I only started running into trouble when I tried to insert this cURL request.I've tried this however it doesn't run. As I am integrating with payment partners, it just says:\[code\]Your transaction has been successful but there was a problem connecting back to the merchant's web site. Please contact the merchant and advise them that you received this error message. Thank you.\[/code\]The exact error that was received was a HTTP 500 error.Thanks.