Trying to pass new client to WHMCS

<?php
add_action("gform_post_submission", "set_post_content", 10, 2);
 function set_post_content($entry, $form){

 function post_to_url($url, $data) {
 $fields = '';
 foreach($data as $key => $value) {
 $fields .= $key . '=' . $value . '&';
 }
 rtrim($fields, '&');

 $post = curl_init();

 curl_setopt($post, CURLOPT_URL, $url);
 curl_setopt($post, CURLOPT_POST, count($data));
 curl_setopt($post, CURLOPT_POSTFIELDS, $fields);
 curl_setopt($post, CURLOPT_RETURNTRANSFER, 1);

 $result = curl_exec($post);

 curl_close($post);
 }

 if($form["id"] == 3){//Full Registration

 $data = array(
 "firstname" =>  $entry["1.3"],
 "lastname" =>   $entry["1.6"],
 "email" =>       $entry["2"],
 "address1" =>    $entry["3.1"],
 "city" =>        $entry["3.3"],
 "state" =>       $entry["3.4"],
 "postcode" =>    $entry["3.5"],
 "country" =>     $entry["3.6"],
 "phonenumber" => $entry["4"],
 "password2" => $entry["3.2"]
 );

 post_to_url("http://microbop.com/", $data);

 }
}
 ?>