<PixiShippingGetPicklistHeadersPost200TextXmlResponse>
  <PLHkey>0</PLHkey>
  <PLHlocID>string</PLHlocID>
  <PLHexpiryDate>string</PLHexpiryDate>
  <createEmp>string</createEmp>
  <createDate>string</createDate>
  <updateEmp>string</updateEmp>
  <updateDate>string</updateDate>
  <PLHfromBox>0</PLHfromBox>
  <PLHtoBox>0</PLHtoBox>
  <ReservedOrderNr>string</ReservedOrderNr>
  <IsReservationFull>true</IsReservationFull>
  <PLcomment>string</PLcomment>
  <_x0031_SS>true</_x0031_SS>
  <PLExecLog>string</PLExecLog>
  <PLexecLogAdvanced>string</PLexecLogAdvanced>
  <PLHOriginalKey>0</PLHOriginalKey>
  <FromBinName>string</FromBinName>
  <ToBinName>string</ToBinName>
  <HALcount>0</HALcount>
  <Item_x0020_number>0</Item_x0020_number>
</PixiShippingGetPicklistHeadersPost200TextXmlResponse>

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:pixiShippingGetPicklistHeaders>
            <LocID xsi:type="xsd:string">001</LocID>
        </ns1:pixiShippingGetPicklistHeaders>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

<?php

getPixiSoapClientResponse('pixiShippingGetPicklistHeaders', [
    'LocID' => '001', // string
]);

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);
}