We are releasing a CS-Cart ecommerce website in the country of Qatar. Sadly many of the credit card processors that are available for CS-Cart do not operate here yet. But there is a local comapny that are willing to integrate their system on our website if that is possible.
is it possible to integrate a gateway that is not from the available list? and how?
Based on other payment gateways available in CS-Cart or addons, you can see what the directory structure should be and what entries to the database should be made.
You will definitely need documentation of the payment system you want to integrate. Because on the basis of this documentation, you have to write the code that will handle the payment.