While implementing the G+ sign in on my site, there were a few "need to know" things that were buried in the documentation.<br>Hopefully this helps someone.<br>I'm using the HTTP API.<br>The "old" system uses the scopes:<br>https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/userinfo.email<br>whereas the new one uses:<br>https://www.googleapis.com/auth/plus.login https://www.googleapis.com/auth/plus.me<<br><strong>Update</strong>: Actually you still need to use<br>https://www.googleapis.com/auth/userinfo.email<br>auth/plus.me does return a bunch of useful profile information, though.<br>You'll see the auth/plus.login fairly quickly while reading the API docs, but mention of the auth/plus.me is a little buried.<br>In the docs the person GET request looks like<br>GET https://www.googleapis.com/plus/v1/people/userId<br> <br>If you're just using auth/plus.login scope, you'll have to request the userid and then make a separate API call to get the person's info. (<br>OR you use auth/plus.me scope and set "me" as the userid in the GET request.<br> <br>I'll update this as I experiment with the API some more.<br> <br><strong>If you'd like to add anything, leave a comment.</strong><br> <br>related links:<br><a href="https://developers.google.com/+/api/latest/people/get#examples" target="_blank">https://developers.google.com/+/api/latest/people/get#examples</a><br><a href="https://googleplusplatform.blogspot.com/2013/02/google-plus-sign-in.html" target="_blank">https://googleplusplatform.blogspot.com/2013/02/google-plus-sign-in.html</a>