'Create an instance of OAuth2Credentials
This is one of the few types if Credentials that you should contrust,
Credentials objects are usually instantiated by a Flow.
Args:
access_token: string, access token.
user_agent: string, The HTTP User-Agent to provide for this
application.
revoke_uri: string, URI for revoke endpoint. Defaults to None; a
token can\'t be revoked if this is None.'

def __init__(self, access_token, user_agent, revoke_uri=None):

    super(AccessTokenCredentials, self).__init__(access_token, None, None, None, None, None, user_agent, revoke_uri=revoke_uri)
