Go to console.cloud.google.comand find the old project for this Demo in order to see its settings (URLs, scopes). Currently, the app is called Calendar from google.
Navigate to the burger icon and from the sidebar select APIs and services → Enabled APIs and services
On the sidebar click on OAuth consent screen → Edit App
Check out the scopes and URLs
Go to Credentials and click on the Edit icon to see the URLs
Now when we checked the old settings let’s create a new project. Click on “New project”
Wait until it is created
Press “SELECT PROJECT”
On sidebar click on OAuth consent screen
Set up a new project , select External and click on “CREATE”
11. Give a name to the app and insert a support e-mail
12. Insert the Authorises domains and e-mail, and click on SAVE AND CONTINUE till the end
After all steps are done you have to Publish the app. Click on PUBLISH APP and in the popup press “Confirm”
Now we need to create the Keys. For that, we go to the Credentials in the sidebar, click on + CREATE CREDENTIALS → OAuth Client ID
15. Select App type → Web Application, and give it a name
16. The fill in the URIs fields and click on SAVE button
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DO NOT forget to add a redirect URL from the Plugin settings as well
After that, the popup will appear in which you can find the Keys that need to be copied and pasted in the Plugins Tab → field App ID/API Key
18. Plugin tab
19. Copy Client Secret and paste in App Secret field