What is the ruling on dealing with the company "ClickBank" which operates on an affiliate marketing system, and does the condition of "hand-to-hand" exchange in buying and selling apply to it?

There is no objection to promoting and brokering the sale of a company's goods for which immediate possession is not a condition at the time of the contract, such as clothing and tools. This is because the condition of immediate, hand-to-hand possession is specific to riba-based transactions, such as the sale of gold and silver for each other or for money. Your work as a marketer for these goods in exchange for a commission is permissible and falls under lawful brokerage and ju'ala (commission-based work). However, if the marketing requires fees or the purchase of a product, the ruling may differ, and the entire method of transaction must be clarified. The ruling depends on the actual contract concluded by the individual with the company.