Thank you. This has started me on the right track, but I'm still not quite there yet. The parameter appears to be 'header' with a lowercase 'h'. But it seems like it only accepts an arrayref containing a hashref. I tried looking through the modules themselves as well as the documentation to see how to structure this and eventually I came to this: 
my $header = [{
    parts => [{
        name => 'token',
        element => 'tns:token',
        destination => $sessionToken,
        mustUnderstand => 1
    }]
}];

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This structure got me the farthest (I was either getting errors about it not being a hashref or arrayref, or a "panic: findName called without name" before). But now I'm getting this error: 
error: cannot find element or attribute `{http://example.com/tns}token
+'

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That despite when I do the login and do a dumper on the $answer variable I get this: 
Answer: $VAR1 = {
          'parameters' => {
                          'Output' => {
                                      'SessionToken' => 'sessiontokenv
+alue'
                                    }
                        },
          '{http://example.com/tns}token' => bless( do{\(my $o = 44800
+400)}, 'XML::LibXML::Element' )
        };

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Yet when I try to add that into the header with that same namespace, it complains it can't find the element. Now I tried making a schema just for this token (since it is not defined in any of the WSDLs or XSDs that the company whose API I am trying to access provides): 
<?xml version="1.0" encoding="utf-8"?>
<xs:schema elementFormDefault="qualified"
  targetNamespace="http://example.com/tns"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns:tns="http://example.com/tns">
  <xs:element name="token" nillable="true" type="xs:string" />
</xs:schema>

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Now I get a different error: Can't call method "header" on unblessed reference at /usr/local/perl/5.16.1/lib/site_perl/5.16.1/XML/Compile/Transport/SOAPHTTP.pm line 340. So now it wants the header to be an object, and it appears the default value comes from HTTP::Headers (which is not the kind of header I want, I'm looking for the SOAP envelope header tag. So how do I build the header element? Thanks.

In reply to Re^2: Passing a session token using XML::Compile::WSDL by SeptamusNonovant
in thread Passing a session token using XML::Compile::WSDL by SeptamusNonovant

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