DragonBe\Vies\Validator\ValidatorGB::validateGovernment PHP Method

    private function validateGovernment($vatNumber)
    {
        $prefix = strtoupper(substr($vatNumber, 0, 2));
        $number = (int) substr($vatNumber, 2, 3);
        // Government departments
        if ($prefix == 'GD') {
            return $number < 500 ? true : false;
        }
        // Health authorities
        if ($prefix == 'HA') {
            return $number > 499 ? true : false;
        }
        return false;
    }