Is it permissible for a sales representative to purchase the target products with his own money while offering incentives to customers in the form of increased quantity, a physical gift, or a monetary gift, and is it permissible for me to request a physical or monetary gift from the representative without purchasing from him or promoting his goods?

If the delegate is authorized by the company to give gifts and incentives and does not exceed this authorization, then there is no harm in accepting them. A gift attached to a sale is considered a reduction in its price, and the contract encompasses both the gift and the item together. For contracts, what matters is the underlying meaning, and the reason for the gift is the sale.

The gift must be known; if it is concealed, it has a different ruling. You may ask for an incentive or gifts due to the sale.

However, if the delegate gives you a gift from the company's gifts without your purchase of the item and without promoting his merchandise, the delegate is not permitted to do so except with the company's permission.