public static function countriesList()
    {
        $path = dirname(realpath(__FILE__)).DIRECTORY_SEPARATOR.'data/countries.json';
        $countries = self::readJson($path, true);

        $listCountries = [];

        foreach ($countries['Names'] as $code => $value) {
            $listCountries[$code] = $value;
        }

        return $listCountries;
    }