Google Wallet
Google Wallet
***Google Checkout is an online payment processing service provided by Google aimed at simplifying the process of paying for online purchases. Users store their credit or debit card and shipping information in their Google Account, so that they can purchase at participating stores by clicking an on-screen button. Google Checkout provides fraud protection and a unified page for tracking purchases and their status. According to a Google update on May 2013, Google Checkout will be ****retired on November 20, 2013.

Google Wallet is a mobile payment system developed by Google that allows its users to store debit cards, credit cards, loyalty cards, and gift cards among other things, as well as redeeming sales promotions on their mobile phone. Google Wallet can use near field communication (NFC) to “make secure payments fast and convenient by simply tapping the phone on any PayPass-enabled terminal at checkout.”

On May 15, 2013, Google announced the integration of Google Wallet and Gmail, allowing users to send money through Gmail attachments.

Google Wallet is only available in the US and to those 18 or older, for now.
Reference
Wikipedia
Online Shopping
Google Wallet
PayPal