Multi-Currency can only display currencies on your storefront and does not have the ability to convert currencies in Shopify's checkout by itself. If you have a grandfathered plan for Bold Cashier installed on your store, you can offer currency conversions on the checkout page.
Please visit Cashier & Multi-Currency Integration for more information on setting up this integration.
To test rounding rules for a currency in Multi-Currency, please follow these steps:
- From Shopify's admin, select Apps.
- Select Multi-Currency.
- Under "Currencies", select the Gear Icon next to the currency you would like to test rounding rules in.
- In the "Want to test your rules?" box, under "Sample Price", enter an amount.
- Select Test it!