Cannot get access token with Google Calendar Api v3

Question

I am trying to put a calendar event into a calendar without the authentication prompt. I have read that using an OAuth Service Account allows you to do this. I have set up the S

Answer 1

It sounds like you need to grant access to the google apps domain user data. Link below under section "Delegate domain-wide authority to your service account".

https://developers.google.com/drive/web/delegation

Answer 2

You may try set the auth like this:

$auth = new Google_Auth_AssertionCredentials(
        SERVICE_ACCOUNT_NAME,
        SCOPES,
        $key,
        'notasecret',
        'http://oauth.net/grant_type/jwt/1.0/bearer',
        ADMIN_USER
        );