How can I get a user's Google+ ID from its email address?

Question

I have a user's Gmail e-mail address and I need to get his or her Google+ ID to get additional information about him or her, like name, and so on. Is there a way to do this using the Google APIs?

Answer 1

There is no publicly available API to identify the Google+ profile associated with an email address. There is an existing feature request you should star if you are interested in such an API.