Change Currency based on Country

-- HikaShop version -- : 2.3.4
-- Joomla version -- : 3.3.3
-- PHP version -- : 5.4.35

Hi want to change currency automatically based on country. so i have used bellow code:
$xml = simplexml_load_file(" www.geoplugin.net/xml.gp?ip=".$_SERVER );
if( $xml->geoplugin_countryCode == 'US' ) {
$app->setUserState('com_hikashop.currency_id',2);
}
but its not changing currency, please help me if i am missing any thing or there is built in option for that.

Hello,
1. Note that you can use a currency switcher module.

2. Using the geolocation plugin will probably help you to do what you want : www.hikashop.com/support/documentation/7...ion.html#description