/**
* Class constructor.
*
* @since 141111 First documented version.
*
* @param int $sub_key Unique subscription key.
*/
public function __construct($sub_key)
{
parent::__construct((string) $sub_key);
}
/**
* Class constructor.
*
* @since 141111 First documented version.
*/
public function __construct()
{
parent::__construct();
}
