How to disallow any currency for any country

Request from the customer: Basically, add a column to the existing table, with a dropdown that shows "all countries" by default OR "selected countries" comma delimited
this way, I can accept Euro only in Euro countries and USD in others.
This will affect the currency dropdown - in case that the current GEO supports one currency, the currency dropdown will not show in client side.
I think that this feature is a must - as it will bring even more flexibility to your plugin.
danny leon

To avoid overloading of the plugin interface by new elements such feature can be realized by hook woocs_currency_data_manipulation:

add_filter('woocs_currency_data_manipulation', function($currencies) {

    global $WOOCS;
    $user_country = $WOOCS->storage->get_val('woocs_user_country');
    switch ($user_country)
    {
        case 'ES':
            unset($currencies['USD']);
            unset($currencies['GBP']);
            break;

        case 'AU':
            unset($currencies['EUR']);
            break;

        default:
            break;
    }

    return $currencies;
}, 1, 1);