Basically base on a Multi-currency app such as Transcy, which simply support to show an indication of the price in the selected currency on the Switcher. The app already use an exchange rate and is only an approximation, even not including fees such as taxes so that is only for your customers' reference on website.

To make the user experience smoothly, Transcy help customers can browse your store in multiple languages even in their local currency and/or language from their first shopping approach to the add to cart page. However, as soon as customers get checkout page to purchase their orders, the store will revert back to the base currency, which they will need to pay in. That means customer will see the price in your store's currency (default currency) and of course they will be charged an FX fee by their bank for shopping in another currency.

For example:

Your base or default currency is USD on Shopify store.

Customer select Japanese Yen (¥) on the currency Switcher, as a result, it will show the price of product in Japanese Yen in the product page like this picture.

When customer click on Buy it now button and go ahead to the checkout page for paying their orders, the store will revert back to your base currency is USD.

The cause is because Shopify manage the conversion for your website, and not all apps are compatible with multi-currency on Shopify as well as different price rounding so we cannot intervene directly the checkout page. But if you're using Shopify payment already, you could use multi currency at the checkout page.

More details, please refer to this article.

Hope this helps you a lot

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