getBillingInfo.php

<?php

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

$apiUser = '';
$key = '';

$accountClient = SoftLayer_SoapClient::getClient('SoftLayer_Account', Null, $apiUser, $key);

$objectMask = "mask[id, hostname, domain, datacenter.longName, billingItem.recurringFee]";
$accountClient->setObjectMask($objectMask);
$hardware = $accountClient->getHardware();

print_r($hardware);