my $soap_wdsl = 'https://example.com/service/API?wsdl';
my $client = SOAP::Lite->new;
$client->proxy( $soap_wdsl );
$client->service( $soap_wdsl );
my $response = $client->setTransaction( $params );

<SOAP-ENV:Envelope
	xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">

<SOAP-ENV:Body>
	<setTransaction>
		<PARAMS HERE>
	</setTransaction>
</SOAP-ENV:Body>