Open https://cloud.google.com/console/project. Click Create Project.

Use any project name and id that you'd want and click Create. Wait for the project to be created.

Click APIs & auth, under APIs make sure Google+ API is ON.

Click Credentials and click on Create New Client ID. Select Web application as Application type. Authorized Javascript origins should be empty. Add {{callbackUrl}} to Authorized redirect URI. Click Create Client ID

Insert Client ID and Client secret in the form below.

Close the help panel and click save changes.