You can view your receipts under the "Activity" section of the app.
You may notice that there is an occasional 0.01 difference between the receipt you received in store, when compared to the in app activity feed receipt.
This is due to a rounding difference between how the app and the register calculate some products when discounts are applied. Don't worry, you have not been over charged, and you can refer to your in store receipt for the correct values when such a discrepancy occurs.
Each in app receipt includes the item you bought, any redeemed vouchers and the number of stamps you have earned will also be displayed on the Activity feed.
There are 3 tabs on top of the Activity section which allow you to filter your Activity based on receipts or messages.