gistfile1.php

<?php
require_once "../../google-api-php-client/src/Google_Client.php";
require_once "../../google-api-php-client/src/contrib/Google_DriveService.php";
require_once "../../google-api-php-client/src/contrib/Google_Oauth2Service.php";

require_once "../basics.php";
require_once "../config.php";

function buildClient($scopes, $sub = false) {
	$key = file_get_contents(SERVICE_ACCOUNT_PKCS12_FILE_PATH);
	$auth = new Google_AssertionCredentials(
		SERVICE_ACCOUNT_EMAIL,
		$scopes,
		$key
	);
	$auth->sub = $sub;
	$client = new Google_Client();
	$client->setUseObjects(true);
	$client->setAssertionCredentials($auth);
	
	return $client;
}

session_start();

$scopes = array(
	"https://www.googleapis.com/auth/admin.directory.group",
	"https://www.googleapis.com/auth/admin.directory.user"
);
$client = buildClient($scopes);

// Option 1. Send raw HTTP request
$req = new Google_HttpRequest("https://www.googleapis.com/admin/directory/v1/groups?domain=domain.edu");
$resp = $client::getIo()->authenticatedRequest($req);
$respBody = $resp->getResponseBody();
pr($respBody);
?>