How to do AJAX in webasyst shipping plugin?

Question

PHP

How to implement an ajax request in json format using the framework in cms webasyst for the delivery plugin Placed the class in the delivery plugin in the class file of the lib folder

class someAppAjaxActions extends waJsonActions
{

...
function testAction()
{
...
$this->response = array(
'valA' => 'value first',
'valB' => 'value second',
);
}

}

No result when calling ajax

$.getJSON('?module=ajax&action=test', function (json) {
alert(json.data.valA);
});

What am I doing wrong? Looking forward to your advice and comments :)