Asking for commission for every client

Q 2: I have electrical equipment, sanitary fittings and construction materials. Some workers ask for commission on every client. Is it permissible to give them commission, taking into consideration that this commission will be added to the client's list of purchases?

A: You have to tell the client about the exact value of the items being bought and not to add any money to the bill, except after informing the clients and after receiving their consent.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.