We added new options in theme options panel.
In theme options panel's Currency Settings tab, you can see new options such as "Currency Converter Key Type" and "Currency Converter API Key".
Our theme uses currency converter api and you can check it in https://www.currencyconverterapi.com/pricing
Please get api key from it and set in theme options panel.
You can set both of free key and premium key, but should set key type correctly in theme options panel.
I hope this article can help you.