This article gives you more information on pricing in foreign currencies, for merchants with WooCommerce (Wordpress) integrations.
More info here : Woocommerce currency info
Due to South African Reserve Bank restrictions, the primary currency needs to be set in the local currency (ZAR)
Also to note : the amount that will be charged would always be slightly different to the expected, since different banks / card schemes use different rates and may also levy additional charges on the customer.
Give your international customers an indication or representative amount that they can expect to be billed on their customer's statement, before checkout :
ANOTHER EXAMPLE :
Add text to your products, to give an APPROXIMATE converted price, in your customers' local currencies :