Most reservation channels allow the price settings exclusively in EUR, therefore, the default currency setting via Rentlio is EUR.
The currency of the channels needs to be aligned with the one set in Rentlio for everything to function properly. The primary currency set in EUR via Rentlio will be sent to the channels and if You wish that the issued invoices via Rentlio contain the equivalent value in another currency, it can be selected, along with the exchange rate, through the invoice settings.
You can access the invoice settings by selecting Property settings > Invoices > Settings
When you issue an invoice after setting the secondary currency, the value will primarily be shown in EUR, while the total EUR amount will also be converted into the secondary currency for information purposes