Hi Christophe,
There does not appear to be method within the application to view the actual JSON message transaction, only XML as you have already pointed out.
The only way I can see where you might be able to view the actual message in the transaction is with an external tool that is capturing the traffic outbound/inbound. Perhaps something like Fiddler or Wireshark may help. It would need to be deployed on the server sending the transaction which should be the one with the Astea Datahandler Dispatcher service running.
We faced this problem in the past, too.
We could see the json strucure on our middleware system as input data, there. Maybe you have a similar option at your endpoint, where the data is send to?
Thanks tgv it’s the other option we were thinking off to trace it on the midlleware
Rgds
Christophe