Authentication Issue with eBatNS Trading API trying to get SessionID - soap

Question

I'm trying to get a session ID using the eBatNS SOAP API.
The function which makes the call is pretty simple, but always returns an Authentication error. You can see the function below
public function get_ebay_session()
{
error_reporting(0);
$ruName = "Forward_Thinker-ForwardT-57fe-4-rybapdi";
$sessionID = "";
//Connect to eBay and get a list of all products
require_once 'eBay/EbatNs/EbatNs_ServiceProxy.php';
require_once 'eBay/EbatNs/GetSessionIDRequestType.php';
require_once 'eBay/EbatNs/EbatNs_Logger.php';
//Get a SessionID
$session = new EbatNs_Session('eBay/config/ebay.config.php');
print_r($session);
echo "<hr>";
$cs = new EbatNs_ServiceProxy($session);
$cs->attachLogger(new EbatNs_Logger(false, 'stdout', true, false));
print_r($cs);
echo "<hr>";
$req = new GetSessionIDRequestType();
$req->setRuName($ruName);
print_r($req);
echo "<hr>";
$result = $cs->GetSessionID($req);
$sessionID = $result->SessionID;
print_r($result);
echo "<hr>";
session_start();
$_SESSION['eBaySessionID'] = $sessionID;
$return = $ruName."\n".$sessionID;
$this->set(compact('return'));
}
As you can see I have attached a logger. The logger shows that this is the request being made.
<?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/" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns="urn:ebay:apis:eBLBaseComponents" ><soap:Header><RequesterCredentials><eBayAuthToken>AgAAAA**AQAAAA**aAAAAA**wS7oUQ**nY+sHZ2PrBmdj6wVnY+sEZ2PrA2dj6wHloSkD5aGog+dj6x9nY+seQ**It4BAA**AAMAAA**CB7yrHTyG3kQbA6KOwf0ZO2MqyPs/Dfn5u5r8ZDVGeWNvB</eBayAuthToken><Credentials><AppId>ForwardT-57fe-41ea-b90e-52fd0b541b88</AppId><DevId>5eefba38-e226-4876-9ada-d8743f571aeb</DevId><AuthCert>b57984cb-ba9c-430c-a8fc-c08f9ac46e75</AuthCert></Credentials></RequesterCredentials></soap:Header><soap:Body><GetSessionIDRequest><Version><![CDATA[815]]></Version><RuName><![CDATA[Forward_Thinker-ForwardT-57fe-4-rybapdi]]></RuName></GetSessionIDRequest></soap:Body></soap:Envelope>
And that this is the response being returned:
<?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<soapenv:Fault>
<faultcode xmlns:ns1="http://xml.apache.org/axis/">ns1:FailedCheck</faultcode>
<faultstring>Authorisation token is invalid.</faultstring>
<faultactor>http://www.ebay.com/ws/websvc/eBayAPI</faultactor>
<detail>
<FaultDetail>
<ErrorCode>931</ErrorCode>
<Severity>Error</Severity>
<DetailedMessage>Validation of the authentication token in API request failed.</DetailedMessage>
</FaultDetail>
</detail>
</soapenv:Fault>
</soapenv:Body>
</soapenv:Envelope>
My ebay.config.php file has all the correct keys and, as far as I can tell, all of the correct information. Does anyone have any tips for resolution?
Danny

Answer 1

This issue was caused by the eBatNS API sending a token from a previous request in the request to get a new token. This isn't supported by ebay.
This is resolved by setting the token mode on the session to 0 or false.
$session->setTokenMode(0)