I'm also from SA but would suggest you fill out the W-8 BEN form. I don't know about the ITIN number as I understand that is for those working in US but are not US citizens. Could someone clarify?
Also, how do you show the Taxman your earnings from DT? I.e. if you are an international contributor and have to provide documents regarding your earnings here, how do you show it if you don't receive an IRP5/IT3?
Canon 650D, 100mm L IS USM Macro, 50mm f1.4
Samsung NX300, 18-55mm, 3...