Starting 1.18 theme version the Price & Currency settings can be found in General-Price & Currency

 

The multi currencies values can be synced through Yahoo Api (there is a daily cron connecting to these API that updates the Currency Value).

For multi-currency, Make sure the symbols are typed according to international standards (which means 3 letters – capslock) – you can find complete list here http://www.xe.com/iso4217.php.

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