Get the product ID from a billing ID

productidfrombilling.php

I am trying to get the Product ID from the billing item ID and something here is not working. 


```
ryan@galileo ~/php % php getbillingid.php
stdClass Object
(
    [allowCancellationFlag] => 1
    [cancellationDate] =>
    [categoryCode] => guest_core
    [createDate] => 2016-02-03T14:18:41-06:00
    [currentHourlyCharge] => .023
    [cycleStartDate] => 2016-02-03T14:24:28-06:00
    [description] => 1 x 2.0 GHz Core
    [domainName] => tinybot.io
    [hostName] => test
    [hourlyRecurringFee] => .023
    [hoursUsed] => 1
    [id] => 83167765
    [laborFee] => 0
    [laborFeeTaxRate] => 0
    [lastBillDate] => 2016-02-03T14:24:28-06:00
    [modifyDate] => 2016-02-03T14:24:28-06:00
    [nextBillDate] => 2016-02-24T00:00:00-06:00
    [oneTimeFee] => 0
    [oneTimeFeeTaxRate] => 0
    [orderItemId] => 107133455
    [parentId] =>
    [recurringFee] => .023
    [recurringFeeTaxRate] => 0
    [recurringMonths] => 1
    [serviceProviderId] => 1
    [setupFee] => 0
    [setupFeeTaxRate] => 0
    [resourceTableId] => 15694805
)
```

I plug the billing ID I get from the previous call in to the following code and it does not return anything

```
<?php

require_once './vendor/autoload.php';
$apiUsername = 'xx';
$apiKey = 'xxx';
$itemId = '83167765'; # Billing ID of the service or item you want to cancel
$billingItemService = 'SoftLayer_Billing_Item';

try {
     $billingItemClient = \SoftLayer\SoapClient::getClient($billingItemService, $itemId, $apiUsername, $apiKey);
     $result = $billingItemClient->getAssociatedParent();
     print_r($result);

 } catch(Exception $e) {
     echo 'Unable to get Associated Parent ID: ' . $e->getMessage();
 }

?>

ryan@galileo ~/php % php productfrombilling.php
ryan@galileo ~/php %
```