Получить баланс аккаунта через PHP

[seoupsu42]

Добрый день господа. Пытаюсь получить баланс аккаунта, пока не получается 
определить класс для PHP

Есть пример JS скрипта, что сейчас использую в скриптах, на PHP не могу 
перевести

    var budgetOrder = AdWordsApp.budgetOrders().get().next();
    var adjustments = budgetOrder.getTotalAdjustments(); // Возвращенные 
средства на аккаунт
    var SpendingLimit = budgetOrder.getSpendingLimit(); // Общий лимит 
аккаунта

Я пытаюсь начать с этого и у меня не получается
<php
namespace Google\AdsApi\Examples\AdWords\v201806\BasicOperations;
require '/googleads-php-lib/vendor/autoload.php';

use Google\AdsApi\AdWords\AdWordsServices;
use Google\AdsApi\AdWords\AdWordsSession;
use Google\AdsApi\AdWords\AdWordsSessionBuilder;
use Google\AdsApi\AdWords\v201806\cm\CampaignService;
use Google\AdsApi\AdWords\v201806\cm\OrderBy;
use Google\AdsApi\AdWords\v201806\cm\Paging;
use Google\AdsApi\AdWords\v201806\cm\Selector;
use Google\AdsApi\AdWords\v201806\cm\SortOrder;
use Google\AdsApi\AdWords\v201806\cm\Budget;
use Google\AdsApi\AdWords\v201806\cm\BudgetService;
use Google\AdsApi\Common\OAuth2TokenBuilder;
use Google\AdsApi\Common\ConfigurationLoader;
const PAGE_LIMIT = 500;

function GetBalance($adWordsServices, $session)
{

    $BudgetOrderService = $adWordsServices->get($session, 
BudgetOrderService::class);
    echo "<pre>ШАБЛОН arResult: ";  print_r($BudgetOrderService); echo 
"</pre>";
.....

Класс BudgetOrderService не существует

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