<PixiGetReturnsPost200TextXmlResponse>
  <Id>0</Id>
  <StatusId>0</StatusId>
  <StatusCode>string</StatusCode>
  <InvoiceId>0</InvoiceId>
  <InvoiceNumber>string</InvoiceNumber>
  <CustomerId>0</CustomerId>
  <RecordCreatedByUserId>0</RecordCreatedByUserId>
  <RecordCreatedByUserName>string</RecordCreatedByUserName>
  <RecordModifiedByUserId>0</RecordModifiedByUserId>
  <RecordModifiedByUserName>string</RecordModifiedByUserName>
  <CreditNumber>string</CreditNumber>
  <CreditedAmount>0</CreditedAmount>
</PixiGetReturnsPost200TextXmlResponse>

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:pixiGetReturns>
            <Offset xsi:type="xsd:integer">100</Offset>
            <RowCount xsi:type="xsd:integer">100</RowCount>
            <StatusId xsi:type="xsd:integer">1</StatusId>
            <InvoiceNr xsi:type="xsd:string">SHO00012345</InvoiceNr>
            <ChangeDateTo xsi:type="xsd:string">YYYY-MM-DD hh:mm:ss</ChangeDateTo>
            <ChangeDateFrom xsi:type="xsd:string">YYYY-MM-DD hh:mm:ss</ChangeDateFrom>
        </ns1:pixiGetReturns>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

<?php

getPixiSoapClientResponse('pixiGetReturns', [
    'Offset' => '100', // integer
    'RowCount' => '100', // integer
    'StatusId' => '1', // integer
    'InvoiceNr' => 'SHO00012345', // string
    'ChangeDateTo' => 'YYYY-MM-DD hh:mm:ss', // string
    'ChangeDateFrom' => 'YYYY-MM-DD hh:mm:ss', // 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);
}