If you want to use the exchange rate will auto-update using API then use these options

- Auto Update Exchange Rate: you can set it no or can set an interval like 30 mins, 1 Hour, 1 Day ……
- Finance API: You can select which finance API you want to use
- Rate Decimals: Set the decimals values
- Send Email: You want when auto-update currency rate sends an email to the admin then enable these settings.
- Custom email: Set can set a different email address here.
After done any changes make sure to click the save button.