Ref: Create Project in Google Developer Console
- Open Google Developer Console. Here is the screen

- To create a new project, Click Project -> Create Project

Here is the new project
- I want to use Social APIs google+ API, so click ‘Google+ API’

- The url would be like this: https://console.developers.google.com/apis/api/plus/overview?project=my-first-project-150703. Then click ‘Enable’
This will enable the Google+ API - Then click ‘Go to credential’
I have to create the credential first! - Here is the credential setting
Then click ‘What credentials do I need?’ - Create the oauth 2.0 setting
Click ‘Create client ID’ - Then set the product name ‘Socialite’

- Then I got my credential for google+
Then click ‘Done’. We’re finished! - Here is the dashboard for my app

- To see the credential details like Client ID and Client Secret for ‘Socialite’ app, click ‘Socialite’ app
