It would be very nice to have a reporting history available for Start-on-Events that are triggered through SOAP calls. If you use REST API and send JSON, it's easy to go through received calls in the logging when you use a webhook. But when you trigger campaigns through a SOAP call to a Start on Event, one can only guess what has been sent.

As a workaround I currently have a http-request following the Start-on-event that receives the SOAP call, in which I rebuild the received call to JSON-format and send it to a webhook so I still have some sort of logging available. But if new fields are added to the SOAP-call they will not automatically appear in the logging, only after I add these fields to my XML to JSON script first. And it's actually a complete misuse of the webhook functionality, but the only way to be able to see what has been sent to a certain campaign using SOAP/XML.