What is the ruling on earning money through affiliate marketing for a company that pays for each file download, and from which I receive 10% of the profits of a user who registers through my referral link, according to the statement: "When the user registers using your referral link, 10% of his profits will be added to your account"?

The question involves two issues: First: The company marketing the client's product by placing their file on its website for an agreed-upon sum based on the number of downloads. This is permissible and is a form of marketing (brokering) or a jua'lah (commission-based payment).

Second: An individual marketing the website's products by bringing in customers through a special link, in exchange for a commission. This is permissible as long as the website does not require fees or the purchase of a product, and its products are free from prohibited items.

Accordingly, what the website stipulates—giving compensation to whoever places their product or brings in a customer—is acceptable. The general rule regarding brokering is permissibility unless there is evidence to prove its prohibition. The general rule regarding transactions is permissibility unless they involve injustice, gharar (excessive uncertainty), or riba (usury).