SolMan to External Service Desk Integration and vi e Versa

Hi Experts,

   We have an requirement where we can integrate SolMan to Externakl service desk and vice versa. The External SD is accepting an XML file. To excahnge the messages we are using PI 7.0 as middleware. Now the questions are

1.how to create an Incident and how to send newly created incident out of SolMan. For this we have identified an webserivce "ICT_SERVICE_DESK_API". But no idea how the structure holds the data of ProcessIncident.

can anyone explain step by step procedure for this. Thanks in advance.

Best Regards

Veera