Configure WHMCS to automatically retrieve current currency exchange rates and use them to update your product prices on a daily basis.
Change a client's currency by creating a new identical client with and transferring invoices, services, and transactions to them.
Change the system default currency from USD to another currency. Only do this if there are no invoices or transaction data in WHMCS.
Use the Universal Currency Converter to find and set a base conversion rate for each currency that you add to your WHMCS installation.
Configure pricing for a product in multiple currencies. You can set multi-currency pricing manually or WHMCS can update it daily.