Keep track of every order and receive push notifications for status updates
Google Wallet, while most associated with NFC payments, is actually most-used as an online payment option competing with the likes of Amazon and PayPal. With today's update to the Google Wallet app, purchases made with the service can now be tracked and managed right from the app. This was always possible (albeit in a basic way) from the Google Wallet website, but having it moved over to mobile has advantages.
After the udpate, you'll receive notifications about the status of your orders, you can track open and previous orders and see everything all in one place. It may not be enough to completely dethrone the other leading payment options, but with each update Google Wallet is becoming more compelling as a payment choice. The update isn't live just yet, but you'll find it from the Play Store link above as soon as it is.