my $soap_wdsl = 'example.wsdl'; # retrieved previously
my $client = XML::Compile::WSDL11->new( $soap_wdsl );
my $call = $client->compileClient('setTransaction');
my $response = $call->( $params );


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

<SOAP-ENV:Body>
	<tns:setTransaction xmlns:tns="http://soap.example.com/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
		<PARAMS HERE>
	</tns:setTransaction>
</SOAP-ENV:Body>


##</code><code>##

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>

##</code><code>##

$client->ns('http://soap.example.com/');

<SOAP-ENV:Envelope
	xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
    xmlns:namesp1="http://soap.example.com/">

<SOAP-ENV:Body>
	<namesp1:setTransaction>
		<PARAMS HERE>
	</namesp1:setTransaction>
</SOAP-ENV:Body>

##</code><code>##

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

<SOAP-ENV:Envelope
	xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
	xmlns:ns1="http://soap.example.com/">

<SOAP-ENV:Body>
	<ns1:setTransaction>
		<PARAMS HERE>
	</ns1:setTransaction>
</SOAP-ENV:Body>