One sneaky Instacart shopper trick is to scan your shopper receipts with a variety of reward apps. You see, there are numerous apps out there that pay you with PayPal cash or free gift cards in exchange for buying products from partner brands and uploading receipts as proof of purchase. However, Instacart receipts are eligible for these apps, and since you’re not paying for the items, it’s completely free cash back. Anyway, some useful receipt scanning apps you can try include: