Step 1) Enabling Additional Currencies In Shopify
Log in to Shopify and go to Settings > Payments
Now click on manage next to your payment gateway. In the image example below, you will see its a testing gateway. However, for any other payment gateway, the setup is the same.
Now click on add currencies and add all the currencies you want to support.
Step 2) Checking The Page Data
First, we need to check if the prices are visually changed on your product landing pages. Navigate to a random product landing page of your choice, in the URL, if you see a query string after your product handle, such as ?variant=32691944357963 add the currency as followed ¤cy=GBP. If all data is correct, you should see a different price and currency symbol.
Then with that URL, check the Rich Results (Structured Data Testing Tool), make sure the prices are also in the same currency, in this case, GBP.
Step 3) Use an APP with Multi Currency Support
Now use an app that supports multi-currency. For example https://www.datafeedwatch.com/ or https://apps.shopify.com/multiple-google-shopping-feeds