What is the ruling on working in a commercial office that receives customer requests, then searches for them in the market and factories, and then offers their price to the customer who does not send the full capital until after receiving the goods?

A sale is valid in one of the following scenarios:

1. Murabaha Sale: Informing the client of the price of the commodity and your profit margin after you purchase it, with the permissibility of taking a deposit as a guarantee of serious intent to buy. 2. Promise to Buy and Sell: A non-binding promise is made, and then the contract is concluded after you have purchased the requested commodity. 3. Agency for a Fee: You act as an agent for the client in purchasing the requested commodity in exchange for an agreed-upon fee.

However, concluding a sales contract before taking possession of the commodity is forbidden and invalid, based on the Prophet's (peace be upon him) saying: "Do not sell what you do not possess."