Scenario: You serve clients in USD, EUR, and GBP regions with different currencies. Setup: Configure three currencies: USD (1.0), EUR (1.1), GBP (1.25) Assign each client's preferred currency in Portal client profiles When creating invoices, client's currency is automatically suggested Invoice amount is calculated and displayed in that currency Customer pays in their local currency; conversion happens at payment Result: International customers see invoices in their local currency but payment amounts always cover the base currency invoice value. Scenario: You need to update exchange rates weekly to maintain accuracy. Setup: Go to Invoices > Currencies weekly For each currency, click Edit and update the exchange rate field Verify rates from a trusted source (XE.com, OANDA, etc.) Save each