Make a dynamic call to MQ in a variable. Once the request is sent , response will be stored in the variable.
To see the response data you can display the variable or you can store in a context varialbe.
Please see the below example.
<xsl:variable name="resultMQ">
<dp:url-open target="url" response="responsecode-ignore" content-type="text/xml" http-method="post">
<soapenv:Envelope>
<soapenv:Header/>
<soapenv:Body>
<Request>
<Message>Request you are sending to MQ</Message>
</Request>
</soapenv:Body>
</soapenv:Envelope>
</dp:url-open>
</xsl:variable>
<!-- Storing the MQ result in Context Variable-->
<dp:set-variable name="'var://context/service/MQResult'" value="$resultMQ"/>