If you have previously configured the Chrome Management setup you can re-use the certificate, client ID and key that was previously used.


https://console.developers.google.com/


Login using the existing Google account that was used to create the original API service account.



Choose Admin SDK




Choose Credentials


Click manage service accounts





If you don't have the original key file in P12 format Click on Create Key




Create Key - Save as P12 format












Click on View Client ID


Copy the Client ID and Service Account information into the Platform Management screen