让WCF识别传入的SOAP请求

我正在尝试编写一个C#应用程序来接收通过HTTP以SOAP形式发送的eBay通知。我正在接收通知,但我无法将它们传递到我的WCF服务。我需要在WCF服务配置上做什么才能识别传入的SOAP请求?我正在使用webHttpBinding和WCF服务。

SOAP请求是:

POST /paypal/ebaynotification.svc HTTP/1.0
Host: myserver.com
Content-Type: text/xml;charset=utf-8
SOAPAction: "http://developer.ebay.com/notification/ItemListed"
Content-Length: 6610
X-Original-Client: 10.71.29.83
Via: 1.0 sjcproxy10b:8081 (squid)
Cache-Control: max-age=86400
Connection: keep-alive

<?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:Header>
  <ebl:RequesterCredentials soapenv:mustUnderstand="0" xmlns:ns="urn:ebay:apis:eBLBaseComponents" xmlns:ebl="urn:ebay:apis:eBLBaseComponents">
   <ebl:NotificationSignature xmlns:ebl="urn:ebay:apis:eBLBaseComponents">RnvpyFAXc9Duo0W+/Mk68g==</ebl:NotificationSignature>
  </ebl:RequesterCredentials>
 </soapenv:Header>
 <soapenv:Body>
      ....
     </soapenv:Body>
   </soapenv:Envelope>

我的WCF服务接口是:

[ServiceContract(Namespace="http://developer.ebay.com/notification")]
public interface Iebaynotification
{
    [OperationContract]
    void ItemListed(ItemType item);
}