I say, and with God's success: This transaction is permissible; because companies like Western Union have prepared a global software that provides remittance services. When you give them an amount of money for conversion, they charge you a fee for this service they provide. This service involves converting the money you pay them into a deposit for you, either in the same currency or in another currency. You can then receive it or someone else can receive it in another country after you have deposited the money with them. What they take from you is a fee for using their extensive software that converts cash to and from, and then the number to money within a system. Therefore, we give it the ruling of a lease. Regarding the exchange, it falls under the arrangement in that this number you have with them after paying the money becomes your right. You can exchange it for any currency in the form of a number, and it is considered in your possession, not in their possession. Thus, the condition of possession for you in the exchange is fulfilled, and we consider such possession to be legal. This is similar to banking transactions, and God knows best.