Important: OAuth 1.0 Has Been Officially Deprecated as of April 20, 2012. It Will Continue to Work as Per Our Deprecation Policy, but We Encourage You to Migrate to OAuth 2.0 as Soon as Possible.

Author: Nov Matake
Important: OAuth 1.0 has been officially deprecated as of April 20, 2012. It will continue to work as per our deprecation policy, but we encourage you to migrate to OAuth 2.0 as soon as possible.

OAuth 1.0 for Web Applications – Google Accounts Authentication and Authorization — Google Developers