On your website you say one can use paypal. I’m from South Africa and when I wanted to activate it, it only said can use Stripe which is not currently available in South Africa.
The short answer is yes, you can use Stampr and be a seller from South Africa or just about anywhere else in the world.
The longer answer is that even though you can use Stampr and build stores you won’t be able to use Stampr Payments which is what allows you to accept credit card payments.
Everything else will work, however, and your customers can checkout, etc. Orders will show up as unpaid and you’ll have to arrange payment outside of Stampr.