After setting the Consent page and enabling Google+ API,
when I try to get credentials for this API there is no option to choose Google+ API on the "Add credentials to your project" page.
Do you have the same problem in the meanwhile or I have to do something else?



That scenario has been expired. Now I found out that I have to just create an OAuth Client ID
Select my application type, add my Authorized JavaScript origins, and Authorized redirect URIs manually.
<script src="https://apis.google.com/js/platform.js" async defer></script>