Yes. Steps to activate are:
1. Add the tag <FEDEXCUSTOMERURL> CustomerWebServiceShippingLinkHere </FEDEXCUSTOMERURL> ,populated with the link from the merchant, to advset in the page mainteditstore.wws
2. Add the tag <FEDEXDEBUG>TRUE</FEDEXDEBUG> to advset in the page mainteditstore.wws
3. The log file, called fedexcustomshipping.log, will be created in
d:\inetpub\YourStoreNameHere\templates\YourSupplierNameHere\fedex