What is the ruling on profiting from the affiliate marketing system of the Fiverr website by requesting the purchase of services through my special link from family and friends using their credit cards, or by requesting that from a person online while refunding their money and rewarding them?

If the website allows this method of purchase and payment of the aforementioned commission, then there is no blame upon you in doing so. However, if the website does not permit it, then it is not permissible for you to earn by this method, as it involves deception, fraud, and a violation of the website's terms. Allah Almighty said: "O you who have believed, fulfill [all] contracts," and the Prophet, peace and blessings be upon him, said: "Muslims are bound by their conditions."