"A R3 processing (authorisation/clearing) fee will be charged for international transactions switched by Mastercard

, for both successful and unsuccessful transactions, whether the transaction was initiated cross-border from outside South Africa or locally from within South Africa"
This isn't clear. What do they mean by "switched"? Paypal already converts to Rand. Steam charges in Rands but I'm not sure if that's settled in Rand or Dollar. So is this for all international transactions, those in other currencies, or some Rand denominated ones as well?