Example of creating a OAuth2Credentials with dummy access token and a working refresh token

gistfile1.py

import datetime
import httplib2
from oauth2client.client import OAuth2Credentials

credentials = OAuth2Credentials("irrelevant access token",
                                "some-random-hash.apps.googleusercontent.com", # Client ID
                                "your-client-secret",
                                "refresh-token",
                                datetime.datetime.now(), # token expiry
                                "https://accounts.google.com/o/oauth2/token")

http = httplib2.Http()
http = credentials.authorize(http)