1- is permissible to charge a fee for acting as a broker or middleman to the seller or the purchaser or both of them, provided that it is done in accordance with the stipulated conditions or local custom.
2- If the broker is working for one of the two parties to the transaction, it is not permissible for him to make a deal with the other party to increase or lower the price.
3- If the broker is working for one of the two parties to the deal in return for a specific fee, he does not have to inform the other party of it.