Client is unauthorized to retrieve access tokens using this method – Google calendar php api

I have read a lot of articles :

Google Calendar API – PHP https://developers.google.com/calendar/quickstart/php

and others.. I want to use the service account, I gave permissions for my calendar, I have downloaded the json key. If I use the code from Google, I got:

missing the required redirect URI

If i use the code:

$client = new GoogleClient();
$client->setApplicationName('Gcal');
$client->setAuthConfig($key_file_location);
$client->setScopes([Google_Service_Calendar::CALENDAR]);
$client->setSubject($calendarId);
$client->setAccessType('offline');
$service = new Google_Service_Calendar($client); 

I have:

Client is unauthorized to retrieve access tokens using this method, or client not authorized for any of the scopes requested

I don’t have admin.google access, I need to access only my own calendar and delete old events. Please let me know what I am missing.

thank you

Answer

I tried to recreate your case and i think i see what’s going wrong.

If you are picking “Web server”, when creating client configuration:

Then you can use php from example, run script, obtain access token from get variables and give it back to console:

However if you are creating client configuration and using “Web browser”, then your script is asking for redirect URI, which you can add to example php:

...
$client = new Google_Client();
$client->setRedirectUri('https://yourdomain.com/somedir');
$client->setApplicationName('Google Calendar API PHP Quickstart');
...

However then you have to go to Google Cloud Platform:

and authorize your domain and your redirect URI. When you run your script now, you will get your access token on redirect site.