push notification get customer values

Hello Guys, my problem is i don't know how get my customer value from the push notification. this is my JSON string:

{"badge": 2, "sound": "default", "alert": "Push Notification Test","pushurl":"http://fortbildung33.de"}

and this is my callback function:

CloudPush.addEventListener('callback', function(evt) {
    alert(evt.payload.pushurl);
});

this is unfortunately not working. if i have a alert of evt get this

{bubbles=false, payload={"android":{"sound":"default","alert":"Push Notification Test","badge":2},"pushurl":"http://fortbildung33.de"}, source=ti.cloudpush.CloudpushModule@4130bb28, type=callback, cancelBubble=false}

I thank you in advance for the help