This is news to me:-

"For instance, a five hour visit to the centre would cost QR28 (2+3+3+10+10) without ticket validation, but after visiting the desk and showing a cinema ticket, the charges for the fourth and fifth hours are reduced to QR3, meaning that the overall cost would be halved to QR14.
Shoppers who spend QR100 at Carrefour can also get their tickets validated to receive two hours free parking."