What is the ruling on dealing in currencies online, known as Forex, and what is the ruling on overnight holding and delayed delivery (clearing) for one to two days after the contract is concluded?

It is permissible to trade currencies if possession is taken and the transaction is free from usurious conditions such as "overnight fees," which are an interest stipulated upon the investor if they do not close the deal on the same day. The Islamic Fiqh Academy has issued a resolution prohibiting margin trading due to its inclusion of explicit usury, combining a loan with an exchange, and its inclusion of forbidden contracts such as trading in bonds and shares of prohibited companies, buying and selling currencies without legitimate possession, options and futures contracts, and selling what one does not own, in addition to its economic harms.