Create a google project at google console

First step is to create and setup a new project on the google console at https://console.cloud.google.com/.

1. Create a project with your prefered name
2. Enable the Google People API
3. Create Credentials
   • Credential Type
     • Select API: People API
     • Check the 'User data' option
   • OAuth Consent Screen
     • Enter App information an Developer contact information
   • Scopes
     • Type contacts in the filter and then set check to
       [x] .../auth/contacts
       [x] .../auth/contacts.readonly
       [x] .../auth/contacts.other.readonly.
   • OAuth Client ID
     • Select Application type: Web application
     • Enter a name for your client (The name of your OAuth 2.0 client is only used to identify the client in the console and will not be shown to end users)
     • Authorized redirect URIs
       • For live system enter the URI to the script that receives an authentication code after login
       • For local development and using the examplecode enter http://localhost/<path-to-package>/GoogleOauth2Callback.php
   • Your Credentials
     Download the created credential information in JSON format. For later access, this is always available on the credentials page.

     For a 'quick start' of the example code, save the credentials in secrets/google_secrets.json in the package directory

4. Add Test user(s)
   While developing/testing your app, you have to add the users that have access asd 'test user'. (Even the own account have to be added):
   • Join 'APIs & services -> OAuth consent screen' on the left in the google console
   • scroll to the section 'Test users'
   • add the users you want to have access to your web application (including your own account)