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I presume you are referring to the currency option in the payment wizard:
Unfortunately, the currency South African Rand is not supported. I also checked the developers page and it seems like it is still not supported, here's the page for it: https://developer.paypal.com/docs/classic/api/currency_codes/?mark=currency
But I will forward this to our developers as a feature request to see if it is possible and I may have just missed something. Please note that I cannot guarantee that this will be implemented, but rest assure that we will update you on this thread as soon as we hear any news.