Google has launched the mobile payment system for its Android operating system, with major US banks planning to join the service in the coming days.Android Pay, which supports fingerprint authentication, will be added to all NFC-enabled devices running Android 4.4 KitKat or above within the next week.Cards from Visa, MasterCard, American Express, and Discover – and from banks including Bank of America, US Bank, PNC – can be added to Android Pay.You can also use a PIN, password or pattern to unlock your phone.If users have smartphones with fingerprint sensors such as the Galaxy S5, users can authorize their payments via the native fingerprint support.In March, Sundar Pichai, senior VP at Google who is responsible for Chrome, said that Android Pay will become a framework where third party developers, particularly in areas such as Africa and China can use it to build their own mobile payment platform.