Google contacts import using oauth2.0

What possible ways to import google contacts using python and oauth2.0 exists?

We successfully got credentials, and our application requests access to contacts, but after getting credentials I can't find way to discover contacts api.

So things like:

 from apiclient.discover import build
 import httplib2
 http = httplib2.Http()
 #Authorization
 service = build("contacts", "v3", http=http) 

Gives us UnknownApiNameOrVersion exception. It looks like Contacts API not in list of supported APIs for apiclient.

I'm looking for alternative ways.