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   <Envelope>
...
       </Body>
    </Envelope>

use SOAP::Lite +trace => 'all';
                                                                      
+          
...
$soap->serializer()->namespaces({'http://schemas.xmlsoap.org/soap/enve
+lope/' => undef});
                                                                      
+          
$soap->call(SOAP::Data->name('Import')->encodingStyle(undef)->attr({xm
+lns => $uri}), SOAP::Data->name(strPayload => $strPayload));