The issue is that my country, Tunisia, doesn't allow local banks to make foreign purchases. In other words, if you have a Tunisian credit card, you are not able to buy anything online. The primary cause of this is that the currency is strictly controlled, but I believe that the government is trying to work on relaxing these restrictions over time. So that removes the possibility of using Stripe/Braintree/etc. as an intermediary for processing payments.

Because of this, the only way to setup a payment processor in Tunisia is to do it the old-fashioned way. I guess my only course of action is to talk with a number of local banks and see if they'd be willing to back a local payment processor.