Converting a simple XML call into a service definition

[mike osterhout]

I was able to get a simple XML call to the eBay api working like below. However I would like to take advantage of Guzzle service definitions but I am not sure how to do this correctly. I was wondering if anyone can supply the code to convert this into a successful service definition and call for our reference. 

$request = $client->post('', [
		'X-EBAY-API-COMPATIBILITY-LEVEL' => '807',
		'X-EBAY-API-DEV-NAME' => 'my-dev-name',
		'X-EBAY-API-APP-NAME' => 'my-app-name',
		'X-EBAY-API-CERT-NAME' => 'my-cert-name',
		'X-EBAY-API-SITEID' => '0',
		'X-EBAY-API-CALL-NAME' => 'GeteBayOfficialTime',
	],
	'<?xml version="1.0" encoding="utf-8"?>
	<GeteBayOfficialTimeRequest xmlns="urn:ebay:apis:eBLBaseComponents">
	<RequesterCredentials>
	<eBayAuthToken>AgAAAA**AQAAAA**</eBayAuthToken>
	</RequesterCredentials>
	</GeteBayOfficialTimeRequest>'
);

[mike osterhout]

I have also posted a SO question here http://stackoverflow.com/questions/14690593/create-guzzle-service-definition-based-on-xml-api-call