Convert 보유 cash to gift certificates

I hadn't used it for a while, but when I tried to redeem a gift certificate, it was gone.

After exchanging my accumulated cash for mobile gift certificates, I can purchase all products sold on Unni Deal, including food items other than cosmetics, right? The rates have gone up and it feels a bit ambiguous, so I plan to save up just a few points, use them all up, and quit Unpa now. The year before last was really generous and fun, but as expected, the benefits for app-based money-making schemes all seem to get worse once the number of subscribers starts increasing.