If you don't have the application, you can download it right now using the link which follows:
Additionally the update also allows you keep your data more secure, by moving it to the cloud. This means your personal data is stored on Google's highly secure servers instead of the secure storage area on your device. A virtual card number is now stored on your device instead of the real number which could have been the reason why most major card companies decided to support Google Wallet.
Another added security benefit is the ability to remotely disable Wallet in the event that you loose your device. The app still requires a PIN number, but you can additionally control the devices you have authorized to use Google Wallet, through its website.
Google Wallet is compatible with the Google Galaxy Nexus, Google Nexus 7, Samsung Galaxy S III, HTC Evo 4G, LG Viper and LG Optimus. Also keep in mind that your devices cannot be rooted if you want to use the Google Wallet service.