A friend said to me: I want to buy a car in return for deferred payment; do you know anyone? I said: Yes. I went to the car’s owner and told him: I have a customer for you, but I want a broker fee without my friend finding out. What is the ruling on what I did?.
There is nothing wrong with working for a seller or a buyer; there is nothing wrong with stipulating a condition in that case. End quote.
Majmoo’ Fataawa Ibn Baaz (19/31).
See also the answer to question no. 45726, in which we explained that it is permissible to accept payment for brokerage, so long as the broker is trustworthy and honest.
And Allaah knows best.