Before the Google+ API Shutdown on March 7, 2019, the people.get and people.getOpenIdConnect methods were available for requesting a person’s profile.
To avoid breaking existing integrations with these methods supporting sign-in, a new minimal implementation only returns basic fields necessary for that functionality, such as name and email address, if authorized by the user. The Legacy People API is where these methods will remain available for existing callers at the existing HTTP endpoints.
The Legacy People API serves a limited new implementation of the legacy Google+ API people.get and people.getOpenIdConnect methods necessary for maintaining sign-in functionality. It is available to existing callers of the original methods that haven't migrated to recommended replacements such as
Google Sign-in or
Google People API at the time of the Google+ API shutdown.
Your Plugin BP Social Connect when you will update?