Is this sale considered legitimate or not, and how should one act in such recurring situations in the future, and is the questioner considered a broker or an agent for the seller or the buyer?

If the inquirer is an agent for the buyer in the purchase, then all the rights of the contract revert to the principal. If the buyer gives a gift to the agent, it belongs to the principal and is considered a reduction in price. The inquirer must inform the buyer of the amount paid (23). If the buyer permits him to keep the remainder, he may take it; otherwise, he must return it to him. However, if the inquirer is merely an intermediary, he may take a commission from one or both parties, provided that the payer is aware of it.