public function __construct($authType, $apiKey, $username, $param)
 {
     parent::__construct($authType, $apiKey, $username, $param);
     self::$event_cache_age = apply_filters('constant_contact_event_cache_age', apply_filters('constant_contact_cache_age', 60 * 60 * 6));
     self::$registrant_cache_age = apply_filters('constant_contact_registrant_cache_age', apply_filters('constant_contact_cache_age', 60 * 60 * 24 * 7));
 }