<PixiGetReturnItemsPost200TextXmlResponse>
  <Id>0</Id>
  <ReasonId>0</ReasonId>
  <ReasonDescription>string</ReasonDescription>
  <ItemId>0</ItemId>
  <EANUPC>string</EANUPC>
  <ItemName>string</ItemName>
  <Quantity>0</Quantity>
  <LocationCode>string</LocationCode>
  <BinId>0</BinId>
  <BestBeforeDate>string</BestBeforeDate>
  <BatchNumber>string</BatchNumber>
  <InvoiceLineId>0</InvoiceLineId>
  <IsSpecialCase>true</IsSpecialCase>
  <CustomerComment>string</CustomerComment>
  <UserComment>string</UserComment>
  <RecordModifiedOn>string</RecordModifiedOn>
  <ItemNrInt>string</ItemNrInt>
  <ReasonCode>string</ReasonCode>
  <ItemClassification>string</ItemClassification>
  <ItemClassificationDescription>string</ItemClassificationDescription>
</PixiGetReturnItemsPost200TextXmlResponse>

POST https://apigateway.descartes.com/tms/pixi/
Content-Type: text/xml; charset=utf-8
# echo -n '{{username}}:{{password}}' | base64 | pbcopy
Authorization: Basic {{token}}

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
                   xmlns:ns1="https://apigateway.descartes.com/tms/pixi/"
                   xmlns:xsd="http://www.w3.org/2001/XMLSchema"
                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                   SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
    <SOAP-ENV:Body>
        <ns1:pixiGetReturnItems>
            <ReturnId xsi:type="xsd:integer">4003</ReturnId> <!-- required -->
            <LanguageId xsi:type="xsd:integer">2</LanguageId>
        </ns1:pixiGetReturnItems>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

<?php

getPixiSoapClientResponse('pixiGetReturnItems', [
    'ReturnId' => '4003', // integer (required)
    'LanguageId' => '2', // integer
]);

function getPixiSoapClientResponse(string $method, array $arguments = [])
{
    $soapArguments = [];
    foreach ($arguments as $key => $value) {
        $soapArguments[] = new SoapVar($value, null, '', '', $key);
    }

    $soapClient = new SoapClient(null, [
        'login' => '...',
        'password' => '...',
        'uri' => 'https://apigateway.descartes.com/tms/pixi/',
        'location' => 'https://apigateway.descartes.com/tms/pixi/',
    ]);

    return $soapClient->__call($method, $soapArguments);
}