static public function getLabel($code)
    {
        static::isValid($code);

        switch ($code) {
            case static::EBP :
                return 'Euro Business Parcel';
            case static::GBP :
                return 'Global Business Parcel';
            case static::EP :
                return 'Express Parcel Guaranteed';
            case static::SHD :
                return 'Shop Delivery Service';
            case static::FDF :
                return 'Flex Delivery Service';
            case static::BP :
            default:
                return 'Business Parcel';
        }
    }