Is it permissible to buy and sell gold online for a fee?

It is a condition for buying and selling gold with money that possession be taken at the time of the contract, based on the Prophet's (peace be upon him) saying: "Gold for gold... hand to hand." Buying gold online often does not achieve immediate possession, as the value is usually sent first, and then the gold is sent after a period, which makes this sale forbidden. It is forbidden to bring customers to this company because of its violation, based on the Almighty's saying: "And do not cooperate in sin and aggression." However, if delivery and receipt occur immediately at the session of the contract, then it is permissible to act as an intermediary, bring customers, and take a fee for that.