<PixiGetInvoicesForCustomerPost200TextXmlResponse>
  <InvoiceNr>0</InvoiceNr>
  <InvoiceDate>string</InvoiceDate>
  <PaymentAddressId>0</PaymentAddressId>
  <ShipmentAddressId>0</ShipmentAddressId>
  <total>0</total>
  <PaymentCode>string</PaymentCode>
  <PaymentText>string</PaymentText>
  <PaymentDate>string</PaymentDate>
  <Paid>true</Paid>
  <TotalToPay>0</TotalToPay>
  <PaidSum>0</PaidSum>
  <CcCardType>string</CcCardType>
  <CcCardNr>string</CcCardNr>
  <CcCardName>string</CcCardName>
  <CcCardExp>string</CcCardExp>
  <Account>string</Account>
  <Blz>string</Blz>
  <BankName>string</BankName>
  <AccountName>string</AccountName>
  <TrackingID>string</TrackingID>
  <ShipDate>string</ShipDate>
  <ReminderLevel>0</ReminderLevel>
  <OrderNr>0</OrderNr>
  <OrderNrExternal>string</OrderNrExternal>
  <OrderCurrencyCode>string</OrderCurrencyCode>
</PixiGetInvoicesForCustomerPost200TextXmlResponse>

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:pixiGetInvoicesForCustomer>
            <CustKey xsi:type="xsd:integer"></CustKey>
            <InvoiceNr xsi:type="xsd:string"></InvoiceNr>
            <CustomerNrExternal xsi:type="xsd:string"></CustomerNrExternal>
        </ns1:pixiGetInvoicesForCustomer>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

<?php

getPixiSoapClientResponse('pixiGetInvoicesForCustomer', [
    'CustKey' => '', // integer
    'InvoiceNr' => '', // string
    'CustomerNrExternal' => '', // 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);
}