Google Social App User Guide
To create a Google Login you must have a Google account, if you already have one, you can skip the registration form:
Access the Google for Developers page:
Click on "Create a Project" or open the Project selector and click on "New Project"
Provide your Project's Name
Click on Project Selector, select the created project and then click on "Enable APIs and Services". At the search field, look for "Google+ API" and "Contacts API".
Enable both APIs clicking at Enable.
At the Side Bar Menu go to "APIs & Services" > "Credentials". Access the "OAuth consent screen", provide at least the "Product name" and then save it.
When created, a modal will be displayed and will provide your app id and app secret (which can be accessed by clicking on the created OAuth Client). When demanded, provide these credentials at the Social-ID platform.
Create Custom Social Login App
Access your marketing account at https://app.socialidnow.com/. Open the dropdown of your account and click on "Social Apps".
Click on "Add a new Social App" and select Google+ type.
Choose a name for your Social App and provide the Client ID and Client Secret from the created Google OAuth Client. At this point, you can also request permissions to which information you want to capture from Google Account when users log in using your Social App. When all set, just click on "Create the Social App" to get your Custom Google+ Social App.