Is it permissible or forbidden to receive a commission for bringing a client to an exchange office?

If you are an agent for your company in currency exchange, you are only permitted to act in the best interest of the company. If you sell for less than the agreed-upon price, you are liable for the deficit. If you sell for more, the surplus belongs to the company, unless they authorize you to keep it. However, if you are merely an intermediary, you are permitted to take a commission, provided that the party from whom you take the commission is aware of it.