What is the ruling on granting a discount card to customers whose total purchases reach a certain limit, and what is the reason for its impermissibility if that is the case?

If the card is free and the purchases are at their true value, then there is no harm in it. However, if the price of the purchases includes the cost of the card, then it is not permissible due to its包含 uncertainty (gharar) and ignorance (jahalah). The resolution of the Islamic Fiqh Academy confirms the impermissibility of cards with a fixed price or an annual subscription due to gharar, and the permissibility of free cards because they fall under the category of a promise of donation or a gift.