Thank you for expressing your interest in getting Shopify Payments launched in South Africa. We do have an existing feature request where other merchants have expressed their interest in this as well. I've added your vote so our teams know there is continued interest in launching Shopify Payments in that region. We can't say guarantee when or if this will become available; however, our teams are always hard at work trying to launch Shopify Payments in as many regions as possible so I'm hopeful we can bring this to South Africa within the near future.
In the meantime, you can use a third-party payment provider available for South Africa. You can view a full list here.