servers_billing_info.php

<?php
include('softlayer-api-php-client/SoftLayer/SoapClient.class.php');

$apiUsername = '';
$apiKey = '';

$accountClient = SoftLayer_SoapClient::getClient('SoftLayer_Account', null, $apiUsername, $apiKey);

$mask = "mask[billingItem[recurringFee, id, orderItem[description, order[userRecord[id, username], id]]]]";

$accountClient->setObjectMask($mask);

$servers = $accountClient->getHardware();

print_r($servers);