Base currency is configurable but can only be changed to a currency that has been added to the system The base currency's exchange rate must always equal 1.0 (enforced automatically) Exchange rates are stored and used at the time of payment; historical rates are not tracked Automatic rate updates require Agency Pulse Portal plugin and active API client Decimal places must be configured per currency; global decimal setting is not available If exchange rates change after invoice is issued but before payment, payment amount will differ slightly from displayed amount Invoices with deleted currencies will use default currency for display Changing the base currency requires careful rate adjustment for all existing currencies