What is the ruling on increasing the price of a product while taking an additional commission, knowing that the marketer will not pay for the product, and that the product will reach the buyer directly from the website?

There is no objection to taking a commission for marketing permissible products if the commission is known. There is also no objection to combining a commission with a price difference if the merchant is aware of and permits it, for the Prophet, peace and blessings be upon him, said: "Muslims are bound by their conditions."