In my previous job I had to do some SOAP-ish work, talking to a drug company. SOAP::Lite does the basics really well, but the moment I wanted to go beyond the basics it got really hard, really fast. None of the WSDL modules I looked at were much use.

I don't know if there have been any better SOAPy modules released since then (and admittedly this was a few years ago), but if there haven't, then I'd suggest that you use a different language.