Once your receipt has been approved, you’ll receive the cash back in your account within a few days. To get started, simply take a photo of your Walmart receipt using the app and then submit it for cash back. Once you’ve done that, you can link your Walmart receipts to your account and start earning cash back. First, you’ll need to sign up for a Walmart Rewards account. If you’re looking to get cash back from your Walmart receipts, there are a few things you need to know.