GoogleUser.getAuthResponse() doesn't contain access_token

Question

UPDATE2: I revisited this issue and have solved the problem by carefully following the doco linked below. But first, for those who are struggling with this,

Answer 1

Figured out the fix for this. Turns out that if we don't provide the login scope config in gapi.auth2.init it doesn't return access_token in getAuthResponse. Please call gapi.auth2.init as given below and access_token will be present.

gapi.auth2.init({
  client_id: ,
  'scope': 'https://www.googleapis.com/auth/plus.login'
})