Question : How to configure google+ app for web login

Answer :

If Google+ login is enabled, Go to Google Developer Console. Then select create project and create a new project. After the project is created, select APIS & AUTH > APIs on the left pane. Find Google+ API on the center pane and turn it ON if it is not turned on already. Then select APIS & AUTH > Credentials on the left pane. Click 'Create new Client ID' button. On the pop up screen select 'Web application' as the application type and provide the necessary information about 'AUTHORIZED JAVASCRIPT ORIGIN' and 'AUTHORIZED REDIRECT URI'. You will get 'Client ID' and 'Client secret'.