JSON web API

Hello,

I'm trying to fetch a list of instances using JSON endpoint:

var request = new XMLHttpRequest();
request.open('POST', 'https://www.botlibre.com/rest/json/get-all-instances', true);
request.setRequestHeader('Content-Type', 'application/json');
var json = JSON.stringify({'application': '721375371321663745'});
request.onreadystatechange = function() {
console.log(request.responseText);
};
request.send(json);

However, I got the following response:

Missing application id. You can obtain an application id from your user page.

Am I doing something wrong? What is the correct way to pass an application id to this JSON endpoint?

The same request body format works fine with JSON "/rest/json/chat":

var request = new XMLHttpRequest();
request.open('POST', 'https://www.botlibre.com/rest/json/chat', true);
request.setRequestHeader('Content-Type', 'application/json');
var json = JSON.stringify({
"application": "721375371321663745",
"instance": "909409",
"message": "Hello"
});
request.onreadystatechange = function() {
console.log(request.responseText);
};
request.send(json);