Using OAuth 2.0 to Access Google APIs

Véase Using OAuth 2.0 to Access Google APIs.

Google APIs use the OAuth 2.0 protocol for authentication and authorization. Google supports common OAuth 2.0 scenarios such as those for web server, installed, and client-side applications.

1. OAuth 2.0 is a relatively simple protocol. To begin, you obtain OAuth 2.0 credentials from the Google Developers Console.
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3. Then your client application requests an access token from the Google Authorization Server, extracts a token from the response, and sends the token to the Google API that you want to access.

To get access keys, go to the Google APIs Console and specify your Google Developers Console. application's name and the Google APIs it will access. For simple access, Google generates an API key that uniquely identifies your application in its transactions with the Google Auth server.

For authorized access, you must also tell Google your website's protocol and domain. In return, Google generates a client ID. Your application submits this to the Google Auth server to get an OAuth 2.0 access token.