Thanks - but I got the same result. I implemented this in the backend:
console.log("Body of push message is: " + JSON.stringify(request.body,null,2));
console.log("Body of push message via Wix is: " + JSON.stringify(request.body.json(),null,2));
Performed another test message push and the result was:
"["Body of push message is: {}"]"
"["Body of push message via Wix is: {}"]"
Other ideas?