After look at the documentation, I was able to conclude that its possible to send and receive JSON files via REST.
I found that I am able to do this communication using JSON, but only when the header is the one that belong to the XML, as you can see in the example (message in format JSON, header XML, with a successful response):
Headers of the previous try:
However when I do exactly the same try, with a JSON header, the response message is an error:
Headers of the previous try:
Once in the documentation available (‘Metrix5_XML_Messages’) its possible to do the communication using JSON files, anyone knows if I am missing something or this is a bug of the product?