Once you finish your shopping you can scan the bar code on your receipt. 'You click services and then you click savings catcher, which has the little piggy bank, ' explained Johnston. Johnston explained 'I check out, I walk a couple feet, or a couple of steps, and before I leave I even leave the store I snap the receipt or I do it when I get to the car.' Since using the app over a year ago, Johnston says she's seen over $50 go back into her wallet.