Alphauserpoints QR Code Modification

Hi, I want someone that can help me with the following: I'm using Alphauserpoints. Each time I create a coupon I would like users to scan one QR code every 24h. I don't want to change the QR code the whole time but would rather like to limit the user to scan the QR code once every 24h. The existing system allows the user to scan the QR code but after that they can't scan the code again. This is quite urgent.