What is the Islamic ruling on working as a sales representative for a company that sells halal products, where the representative earns the difference between the purchase price and the selling price to the customer without prior payment to the company, and receives points and monetary rewards upon achieving specific sales targets, as well as benefiting from sales made through their own website, and the company uses Visa cards in its sales transactions?

The described transaction is generally permissible as long as the product is lawful, and provided that the marketer is truthful. The price increase that the marketer takes for himself with the company's permission is permissible, based on the saying of Ibn Abbas: "There is no harm in saying: 'Sell this garment, and whatever exceeds such and such amount is yours.'" Incentive bonuses for the marketer in the form of redeemable points, and the commission that the website owner takes upon sale, are considered a form of ju'alah (stipulated reward) and are permissible. The use of Visa cards for payment does not affect the permissibility of marketing lawful products, and the marketer is not obligated to inquire about the payment method.