I've found another app where you can upload your shopping receipts for something in return and this app gives you coins for each receipt you upload. These coins can then be used to enter a prizedraw to win various items. Even better, if you don't win, you can play a mini game to win back some of the coins you used for a prizedraw entry.
The only downside is that the prizes aren't fantastic e.g. a laptop rucksack, steam cleaner, bean bag. They aren't things to get really excited about but if you win you can always sell and the app doesn't cost you anything.
The app is currently only available to Android users and when you do download please use this referral code for extra coins: 8px8m