public function notify_users($users, $type)
 {
     if (is_array($users) && !empty($users)) {
         $front_form_service = new RM_Front_Form_Service();
         foreach ($users as $id) {
             $user = get_user_by('id', $id);
             $params = new stdClass();
             $params->email = $user->user_email;
             $email = $front_form_service->prepare_email($type, null, $params);
             RM_Utilities::send_mail($email);
         }
     }
 }