How to display your store prices in a specific currency? (Google Shopping compatibility)
Although Currency Converter Plus detects the visitor's local currency to display the prices, displaying store prices in a specific currency can be forced by appending the following URL parameter:
?currency=<currency_code>
For example, if you want prices to be displayed in Canadian dollars, the URL would be:
http://mystore.myshopify.com?currency=CAD
If your URL already has some parameter, you should use the '&' character:
http://mystore.myshopify.com?some-parameter=some-value¤cy=CAD
This is a good way to make your URLs compatible with Google Shopping, according to https://support.google.com/merchants/answer/160637?hl=en