Go to https://console.cloud.google.com/projectselector2/home/dashboard
Click Create Project
Enter name and click Create
Click on Navigation Menu (top left icon)
Click on Api & Services / Library
In Search box enter youtube data api v3
Click on result and then Enable
Click on Create Credentials
Select Youtube Data API v3
Click User Data and click next
Input app name and the rest of the fields and click save
Click on Add or remove scopes and choose: .../auth/youtube.upload
Click Save and Continue
In application type select Web Application
Name your web client
Add Authorized redirect URIs:
https://app.pixamattic.com/settings/socialmedia/youtube_callback
Click Create and then Done
On the next Page click Create Credentials and chose API key
Copy your api Key
Then go to app and login as admin user, click on API Keys, paste the API key under Google Api key (Simple API access)
Back to Google Cloud Platform
Click on the pencil icon and copy the Client ID and the Client Secret
Go back to app and paste the Google Client Id and Google Client Secret
Click Save