What is the ruling on selling towels with nanotechnology that clean with water only, and working in marketing their products through a system based on a commission per unit, a "cashback" account on sales, gifts upon reaching certain sales targets, in addition to a bonus for introducing new partners?

It is permissible to participate in this marketing system if the participant is not obliged to pay fees or purchase a product, but rather their role is limited to promoting the company's goods and guiding marketers to them without lying or deception. The condition of selling fifty products or more to be eligible for commission does not affect its permissibility, as brokerage is a form of جعالة (a promised reward for a specific act), which is permissible.