To enable Soap Logging in the ECF, you will need to uncomment the Public Store web.config file at the following line:

<soapExtensionTypes>
        <!--
     <add type="Mediachase.eCF.ClientLib.DefaultSOAPHandler, Mediachase.eCFClientLib" priority="1" group="0" />
         -->
</soapExtensionTypes>

The log file is located under PublicStore/App_Data/Log