Thanks, That was really helpful. The choices SOAP::Lite makes for the data structure seem entirely random (Hash or Array?!!) and unpredictable to me, so I just chose to get XML and parse it this way. It works for now. I'm open to more elegant solutions, but it works.

foreach my $campaign 
    (@{$output->{'SOAP-ENV:Body'}->{APIResponse}->{ClickFraudReport}->
+{Campaigns}->{Campaign}} ) {
    print "\n\n";
    print " Campaign: $campaign->{Name}\n";
    print " Cost: $campaign->{Cost}\n";
        ...
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