The People API lets you list and manage the authenticated user's Contacts and retrieve profile information for authenticated users and their contacts.
The people information that the People API retrieves is merged from various sources, depending on the following conditions:
- Public Google profile data Always.
- Google Apps domain profile data The domain admin has enabled external contact and profile sharing of domain-scoped data.
- The authenticated user's private profile information One of the profile scopes has been granted.
- The authenticated user's contacts The contacts scope has been granted.