AdWordsUser::SetClientCustomerId PHP Method

    public function SetClientCustomerId($clientCustomerId)
    {
        $this->SetHeaderValue('clientCustomerId', $clientCustomerId);
    }

<?php

/**
 *
 * PHP version 5
 *
 * Created by PhpStorm.
 * User: Георгий
 * Date: 30.10.13
 * Time: 22:44
 */
require_once 'vendor/autoload.php';
$user = new AdWordsUser();
$user->SetClientCustomerId(0);
$campaignService = $user->GetService('CampaignService', 'v201605');
$selector = new Selector();
$selector->fields = ['Id', 'Name', 'Status', 'ServingStatus', 'StartDate', 'EndDate', 'Amount', 'BudgetId', 'TargetGoogleSearch', 'TargetSearchNetwork', 'TargetContentNetwork', 'TargetPartnerSearchNetwork'];
$result = $campaignService->get($selector);
var_dump($result);