First time using the PHP SOAP client - php

Question

I've started writing some code to use SOAP within PHP.
Managed to get my code to login and authenticate, which is a start!
I initially had the following code :
$params = array(
"Parcels" => 1,
"RecipientAddress" => "123 Any Street, Any Town, Anywhere",
"RecipientName" => "Joe Bloggs",
"CollectionDate" => "2019-11-11",
);
// Invoke WS method (Function1) with the request params
$response = $client->__soapCall("GetAvailableServices", array($params));
// Print WS response
var_dump($response);
Which returned the following message :
Fatal error: Uncaught SoapFault exception: [SOAP-ENV:Client] Missing Recipient Address Element 'RecipientName' in /home/thisone/public_html/despatchbayservices.php:17 Stack trace: #0 /home/thisone/public_html/despatchbayservices.php(17): SoapClient->__soapCall('GetAvailableSer...', Array) #1 {main} thrown in /home/thisone/public_html/despatchbayservices.php on line 17
I've tried changing the code to :
$params = array(
"Parcels" => 1,
"RecipientAddress" => array(
"RecipientName" => "Joe Bloggs",
),
"CollectionDate" => "2019-11-11",
);
// Invoke WS method (Function1) with the request params
$response = $client->__soapCall("GetAvailableServices", array($params));
// Print WS response
var_dump($response);
Which returned this :
Fatal error: Uncaught SoapFault exception: [Client] SOAP-ERROR: Encoding: object has no 'RecipientAddress' property in /home/thisone/public_html/despatchbayservices.php:18 Stack trace: #0 /home/thisone/public_html/despatchbayservices.php(18): SoapClient->__soapCall('GetAvailableSer...', Array) #1 {main} thrown in /home/thisone/public_html/despatchbayservices.php on line 18
I'm sure I'm doing something really stupid but I just cant see it - any help massively appreciated!

Answer 1

Sussed it - thanks to Don't Panic for pointing me toward the WDSL.
For reference the correct/working code is :
$params = array(
"Parcels" => array(
"ParcelType" => array(
"Weight" => 5,
"Length" => 5,
"Width" => 5,
"Height"=> 5,
)
),
"RecipientAddress" => array(
"RecipientName" => "Joe Bloggs",
"RecipientAddress" => array(
"CompanyName" => "My Company",
"Street" => "123 Any Street",
"Locality" => "Anywhere",
"TownCity" => "Any Town",
"County" => "Somewhere",
"PostalCode" => "TS23 4EA",
"CountryCode" => "GB",
)
),
"CollectionDate" => "2019-11-11",
);
// Invoke WS method (Function1) with the request params
$response = $client->__soapCall("GetAvailableServices", array($params));