Thanks for your reply. I actually fixed the code and added couple countries. i will put the code here for anyone who wants to reuse it (need to replace {API_TOKEN} with your token from extreme-api-lookup).
you can put the code in head part in custom code in order for the code to run before the page is rendered. Also you need to have a premium website in order to add the wix currency converter (change the currency converter element to hidden as the currency will be converted automatically).
I hope it helps 