API:getProductUpgrades - Get applicable upgrades

GET http://url_to_your_hostbill.com/admin/api.php?api_id=API_ID&api_key=API_KEY&call=getProductUpgrades&id=ID

<?php
   include 'class.hbwrapper.php';
   HBWrapper::setAPI('http://url_to_hb.com/admin/api.php','API ID','API Key');
   $params = array(
      'id'=>ID
   );
   $return = HBWrapper::singleton()->getProductUpgrades($params);
   print_r($return);
?>

<?php
   $url = 'http://url_to_hb.com/admin/api.php';
   $post = array(
      'api_id' => API_ID,
      'api_key' => API_Key,
      'call' => 'getProductUpgrades',
      'id'=>ID
   );
   $ch = curl_init();
   curl_setopt($ch, CURLOPT_URL, $url);
   curl_setopt($ch, CURLOPT_POST, 1);
   curl_setopt($ch, CURLOPT_TIMEOUT, 30);
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
   curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
   curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
   curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
   $data = curl_exec($ch);
   curl_close($ch);
  
   $return = json_decode($data, true);
   print_r($return);
?>

<?php
   /* Use this method to access HostBill api from HostBill modules */
   $api = new ApiWrapper();
   $params = array(
      'id'=>ID
   );
   $return = $api->getProductUpgrades($params);
   print_r($return);
?>