com.google.api.client.util.Beta 
 Auth object framework that will provide an interface to create easy to use, object-oriented
 methods to obtain and manage auth credentials.
Warning: starting with version 1.7, usage of this for OAuth 2.0 is deprecated. Instead use
 com.google.api.client.auth.oauth2.
Interfaces
Credential (deprecated)
Deprecated. Use com.google.api.client.auth.oauth2.Credential.
Beta 
 Implementations of this class will have all of the information necessary to create and install
 the necessary handlers on an HttpTransport object to allow for a streamlined auth
 experience.
Implementations of this interface should use the PersistenceCapable annotation to allow credentials to be managed on behalf of the application.
Warning: starting with version 1.7, usage of this for OAuth 2.0 is deprecated. Instead use com.google.api.client.auth.oauth2.Credential.
ThreeLeggedFlow (deprecated)
Deprecated. Use com.google.api.client.auth.oauth2.AuthorizationCodeFlow.
Beta 
 Interface for auth flows that require a user authorization step through a web browser to obtain
 an authorization code.
Implementations are required to be PersistenceCapable for storage in JDO compliant datastores during user authorization step.
Warning: starting with version 1.7, usage of this for OAuth 2.0 is deprecated. Instead use com.google.api.client.auth.oauth2.AuthorizationCodeFlow.