message3.xml

<bpmn:sendTask id="send_task_letter" name="Send romantic words" messageRef="love_letter">
    <bpmn:extension>
        <spiffworkflow:messagePayload>
{
    'to': {'name': my_lover_var},
	  'from': {'name': 'buddy'},
  	'salutation': 'Dear Beloved',
    'body': 'Oh how my heart yearns for you!'
}
        </spiffworkflow:messagePayload>
    </bpmn:extension>
    <bpmn:incoming>Flow_1bl6jeh</bpmn:incoming>
    <bpmn:outgoing>Flow_0tp8uut</bpmn:outgoing>
</bpmn:sendTask>