What is the ruling on purchasing store credit and gift cards at prices lower than their face value, knowing that they cannot be converted into cash and can only be used to buy goods from their source?

A voucher that entitles its holder to receive goods and cannot be exchanged for cash is considered a document representing goods, and the rules governing dealings with cash do not apply to it. The ruling on selling these vouchers differs based on how they were obtained:

1. If the voucher was obtained through a compensatory transaction (purchase or in exchange for work): It is absolutely impermissible to sell it before taking possession of the goods it represents. This is due to the prohibition of selling goods before acquiring them, whether they are food or otherwise, and this is the preferred view.

2. If the voucher was obtained without a compensatory transaction (as a gift or present): It is permissible to sell it before taking possession of the goods it represents. This is the preferred view among the Shafi'is, Malikis, and others.

Based on this, whoever receives a voucher as a gift may sell it for more or less than its value. However, whoever purchased it may not sell it until they take possession of the goods it represents.