Hyde here from Shopify.
This is the list for gateways that are currently verified through Shopify for Saudi Arabia. Other gateways can be integrated but because that is the list of verified gateways with Shopify, they are the only ones we can support. This is because we cannot guarantee how an external gateway that is unverified through Shopify would work with our platform.
To use a payment gateway that is not on Shopify, you would have to hire a developer to set it up as an external redirect checkout that can use that gateway. Here is a link to our Shopify Experts to assist you if you need it.
I hope that helps!
All the best, Hyde.