I'm trying to set up Google+ Authentication by following these instructions: https://developers.google.com/+/api/oauth
I've activated the Google+ API within my project on the Google Developers Console, but when I click Credentials in the side bar, the "Create new Key" button is grayed out. Am I missing a step somewhere?
Edit: On a possibly related note, clicking "Create new Client ID" only includes an option for "Installed application" and not "web application" or "service account". Do I need to add another API to have these options enabled?