Conditions for Purchase by Advance Payment contract

2118. Purchase by advance payment means that a buyer pays the price of a commodity, and takes its possession later. For example, if the buyer says, "I am paying this amount so that I may take possession of such and such commodity after six months" and the seller says, “I agree", or the seller accepts the money and says “I have sold such and such thing and will deliver it after six months". The transaction is valid.