Is it permissible to work as an intermediary between "Souq.com" and customers by ordering products for them, with their knowledge that the products are from "Souq.com," in order to receive a commission, despite the company's prohibition of this action?

This work falls under permissible brokerage if it does not involve assisting in a forbidden sale, and it is considered a form of جعالة (commisson/fee for a service). You are entitled to the commission if someone buys through you, and you must adhere to the website's terms, as long as they do not permit the forbidden or forbid the permissible. Do not act as an agent for customers in purchasing, but you can explain the method of purchase and data entry. You must avoid buying for yourself and then selling to them.