function run()
 {
     $my_key = CRM_Core_BAO_Setting::getItem(self::MC_SETTING_GROUP, 'security_key', NULL, FALSE);
     CRM_Mailchimp_Utils::checkDebug('CRM_Mailchimp_Page_WebHook run $my_key= ', $my_key);
     if (CRM_Core_Config::singleton()->userPermissionClass->isModulePermissionSupported() && !CRM_Mailchimp_Permission::check('allow webhook posts')) {
         CRM_Core_Error::fatal();
     }
     // Check the key
     // @todo is this a DOS attack vector? seems a lot of work for saying 403, go away, to a robot!
     if (!isset($_GET['key']) || $_GET['key'] != $my_key) {
         CRM_Core_Error::fatal();
     }
     if (!empty($_POST['data']['list_id']) && !empty($_POST['type'])) {
         $requestType = $_POST['type'];
         $requestData = $_POST['data'];
         switch ($requestType) {
             case 'subscribe':
             case 'unsubscribe':
             case 'profile':
                 // Create/Update contact details in CiviCRM
                 $delay = $requestType == 'profile';
                 $contactID = CRM_Mailchimp_Utils::updateContactDetails($requestData['merges'], $delay);
                 $contactArray = array($contactID);
                 // Subscribe/Unsubscribe to related CiviCRM groups
                 self::manageCiviCRMGroupSubcription($contactID, $requestData, $requestType);
                 CRM_Mailchimp_Utils::checkDebug('Start - CRM_Mailchimp_Page_WebHook run $_POST= ', $_POST);
                 CRM_Mailchimp_Utils::checkDebug('Start - CRM_Mailchimp_Page_WebHook run $contactID= ', $contactID);
                 CRM_Mailchimp_Utils::checkDebug('Start - CRM_Mailchimp_Page_WebHook run $requestData= ', $requestData);
                 CRM_Mailchimp_Utils::checkDebug('Start - CRM_Mailchimp_Page_WebHook run $requestType= ', $requestType);
                 break;
             case 'upemail':
                 // Mailchimp Email Update event
                 // Try to find the email address
                 $email = new CRM_Core_BAO_Email();
                 $email->get('email', $requestData['old_email']);
                 CRM_Mailchimp_Utils::checkDebug('CRM_Mailchimp_Page_WebHook run- case upemail $requestData[old_email]= ', $requestData['old_email']);
                 // If the Email was found.
                 if (!empty($email->contact_id)) {
                     $email->email = $requestData['new_email'];
                     $email->save();
                     CRM_Mailchimp_Utils::checkDebug('CRM_Mailchimp_Page_WebHook run- case upemail inside condition $requestData[new_email]= ', $requestData['new_email']);
                 }
                 break;
             case 'cleaned':
                 // Try to find the email address
                 $email = new CRM_Core_BAO_Email();
                 $email->get('email', $requestData['email']);
                 CRM_Mailchimp_Utils::checkDebug('CRM_Mailchimp_Page_WebHook run - case cleaned $requestData[new_email]= ', $requestData['email']);
                 // If the Email was found.
                 if (!empty($email->contact_id)) {
                     $email->on_hold = 1;
                     $email->holdEmail($email);
                     $email->save();
                     CRM_Mailchimp_Utils::checkDebug('CRM_Mailchimp_Page_WebHook run - case cleaned inside condition $email= ', $email);
                     CRM_Mailchimp_Utils::checkDebug('CRM_Mailchimp_Page_WebHook run - case cleaned inside condition $requestData[new_email]= ', $requestData['email']);
                 }
                 break;
             default:
                 // unhandled webhook
                 CRM_Mailchimp_Utils::checkDebug('End- CRM_Mailchimp_Page_WebHook run $contactID= ', $contactID);
                 CRM_Mailchimp_Utils::checkDebug('End- CRM_Mailchimp_Page_WebHook run $requestData= ', $requestData);
                 CRM_Mailchimp_Utils::checkDebug('End- CRM_Mailchimp_Page_WebHook run $requestType= ', $requestType);
                 CRM_Mailchimp_Utils::checkDebug('End - CRM_Mailchimp_Page_WebHook run $email= ', $email);
         }
     }
     // Return the JSON output
     header('Content-type: application/json');
     $data = NULL;
     // We should ideally throw some status
     print json_encode($data);
     CRM_Utils_System::civiExit();
 }