Quick license manager webservice doesn't accept request - php

Question

I want to use the Quick License Manager SOAP webservice to connect an e-commerce wordpress plugin to enable the user to buy a license and show it after a successful purchase.So for now, I'm trying to call the function GetProductInfo to get the info of an existing product I created with the QLM Management Console.I use the SoapClient php class but when I try to make a request I get this response :
Error validating request: The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters. . Caller: GetProductInfo
I don't understand what's wrong with my request, so I need help...
Here is the code I use :
<?php
$url = "https://quicklicensemanager.com/****/qlm/qlmservice.asmx";
$wsdl = $url . "?WSDL";
$soapClient = new SoapClient($wsdl, array(
"encoding" => "utf8",
"trace" => TRUE,
"version" => SOAP_1_1
));
$req = sprintf(
'<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Header>
<QlmSoapHeader xmlns="http://www.interactive-studios.net/qlmweb">
<CultureName>%s</CultureName>
<UtcOffset>%d</UtcOffset>
</QlmSoapHeader>
</soap:Header>
<soap:Body>
<GetProductInfo xmlns="http://www.interactive-studios.net/qlmweb">
<eProductName>%s</eProductName>
<productID>%d</productID>
<major>%d</major>
<minor>%d</minor>
</GetProductInfo>
</soap:Body>
</soap:Envelope>', "en_US", 0, "The IO plug-in: Student License", 4, 1, 0);
echo '<pre>';
print_r(htmlentities($req));
echo '</pre>';
$action = "http://www.interactive-studios.net/qlmweb/GetProductInfo";
$res = $soapClient->__doRequest($req, $url, $action, 1);
echo '<pre>';
print_r($res);
echo '</pre>';
echo "=======================================================";
echo '<pre>';
print_r(htmlentities($soapClient->__getLastRequest()));
echo '</pre>';
echo "=======================================================";
echo '<pre>';
print_r($soapClient->__getLastRequestHeaders());
echo '</pre>';
Thanks in advance for your help.
EDIT
Now I tried to change the field productID and it appears that it is the one that was wrong. So it needs to be a base64 string, so I updated my code :
</soap:Envelope>', "en_US", 0, "The IO plug-in: Student License", 4, 1, 0); becomes </soap:Envelope>', "en_US", 0, base64_encode("The IO plug-in: Student License"), 4, 1, 0);
The new error message is :
Error validating request: Length of the data to decrypt is invalid.. Caller: GetProductInfo

Answer 1

After hours of searching, I found this in the documentation, at page 121 :
Note that all the methods exposed by the web service cannot be called with a URL except GetActivationKey
and ActivateKey. All other web methods implement a secure authentication mechanism that only accepts
requests from the QLM Console.
So, as I was trying to call GetProductInfo, it couldn't work outside the QLM Console.