Is money earned through a commission imposed by a client as an intermediary to complete a sales and purchase transaction, where he takes a portion of the price of the goods for himself, halal or haram?

This client has two scenarios: The first: He is an agent for the company for which he intends to purchase; in this case, it is not permissible for him to take a commission. The second: He is not an agent, but rather a broker; in this case, there is no objection to him taking a fee from one party or both parties.