Is it permissible to sell shopping vouchers that grant the right to acquire goods worth their value, for a price that may equal their value or be less than it?

A staff member selling vouchers issued by companies as gifts or rewards, which are offers and not cash, represents selling a gift before taking possession of it. This is a matter of scholarly disagreement. The Malikis have held that it is permissible to sell before taking possession, except for food exchanged for compensation. It is permissible for food if it is given as a donation, such as a gift, a loan, or an inheritance.