1. Navigate to Connect > OAuth2 Credentials.
2. Select the project you want the credential associated with or select an asterisk (*) to create a credential that may be used by all projects.
3. Click the Add OAuth2 Credential button.
4. Configure the credential settings:
   1. Enter a unique NAME for the OAuth2 Credential.
   2. Select GOOGLE_EXTENDED for the PROVIDER.
5. Add the service account information:
   1. Open the JSON file you received when you created the Service Account Key.
   2. Copy and paste the contents into the GOOGLE SERVICE ACCOUNT JSON field.
6. Click Save.