That is not a problem. When you elect to do a cash payment at Checkers, Shoprite, OK, House & Home, the Post Office and USave, you will receive a barcode at the bottom (See the example). Use that bar code as part of your payment. It should trackback to your payment profile. Please note: Give it about 24 to 48 hours as the retailers cash in at the end of the day, or every second day. There may, therefore, be a slight delay.
Ps. Please use the code you were given by Sage Pay or PayFast - do not use the code in the example.