通过SoapClient连接eBay交易API抛出'web服务eBayAPI未正确配置或未找到并被禁用'

我正试图连接到ebay交易API，并使用PHP的SoapClient类进行基本请求，但我遇到了麻烦。我花了好几个小时搜索和摆弄例子，但我还是没有得到任何东西。所以我写了下面的基本代码，我试图让它工作:

$token  = [token here];
$client = new SOAPClient('http://developer.ebay.com/webservices/latest/eBaySvc.wsdl', array('trace' => 1, 'features' => SOAP_SINGLE_ELEMENT_ARRAYS));
$header = new SoapHeader('urn:ebay:apis:eBLBaseComponents', 'RequesterCredentials', new SoapVar(array('ebayAuthToken' => $token), SOAP_ENC_OBJECT), false);
$client->__setSoapHeaders(array($header));
$method = 'GeteBayOfficialTime';
$parameters = array(
);
try {
    $responseObj = $client->__soapCall($method, array($parameters));
}
catch (Exception $e)
{
    echo 'Exception caught. Here are the xml request & response:<br><br>';
    echo '$client->__getLastRequest():<br><pre><xmp>' . $client->__getLastRequest() . '</xmp></pre>';
    echo '$client->__getLastResponse():<br><pre><xmp>' . $client->__getLastResponse() . '</xmp></pre><br>';
    echo '<p>Exception trying to call ' . $method . '</p>';
    echo '$e->getMessage()';
    echo '<pre>' . $e->getMessage() . '</pre>';
}

输出为:

Exception caught. Here are the xml request & response:
$client->__getLastRequest():
<?xml version="1.0" encoding="UTF-8"?> <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="urn:ebay:apis:eBLBaseComponents" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><SOAP-ENV:Header><xsd:RequesterCredentials><ebayAuthToken>[token was here]</ebayAuthToken></xsd:RequesterCredentials></SOAP-ENV:Header><SOAP-ENV:Body><ns1:GeteBayOfficialTimeRequest/></SOAP-ENV:Body></SOAP-ENV:Envelope>
$client->__getLastResponse():
<?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>soapenv:Server.userException</faultcode> <faultstring>com.ebay.app.pres.service.hosting.WebServiceDisabledException: The web service eBayAPI is not properly configured or not found and is disabled.</faultstring> <detail/> </soapenv:Fault> </soapenv:Body> </soapenv:Envelope>

Exception trying to call GeteBayOfficialTime
$e->getMessage()
com.ebay.app.pres.service.hosting.WebServiceDisabledException: The web service eBayAPI is not properly configured or not found and is disabled.

谁能帮我把这个修好?部分问题可能是我不知道SoapHeader函数("namespace")的第一个参数中应该包含什么。

$token    = '';
$appId    = '';
$wsdl_url = 'ebaysvc.wsdl.xml'; // downloaded from http://developer.ebay.com/webservices/latest/eBaySvc.wsdl
$apiCall = 'GetUser';
$client = new SOAPClient($wsdl_url, array('trace' => 1, 'exceptions' => true, 'location' => 'https://api.sandbox.ebay.com/wsapi?callname=' . $apiCall . '&appid=' . $appId . '&siteid=0&version=821&routing=new'));
$requesterCredentials = new stdClass();
$requesterCredentials->eBayAuthToken = $token;
$header = new SoapHeader('urn:ebay:apis:eBLBaseComponents', 'RequesterCredentials', $requesterCredentials);
// the API call parameters
$params = array(
    'Version' => 821,
    'DetailLevel' => 'ReturnSummary',
    'UserID' => ''
);
$responseObj = $client->__soapCall($apiCall, array($params), null, $header);  // make the API call