If you sell in different currencies in addition to your home currency, you will need a plan that includes multi-currency with Xero or QuickBooks.
Link My Books will collect your sales and transaction data in the currency they were made in and generate settlements in those same currencies.
You will need to ensure that you have the currencies set up and active in your Xero or QuickBooks otherwise you will be unable to send the settlements across. Please see the below links for each software;
Once the settlements have been sent across they will be converted into your home currency by Xero or QuickBooks