Ionic Push Register function

Hi guys.i have a problem with ionic push notification,i have installed phonegap-plugin push .but i cant see my device token ;
This is my code

  var push = new Ionic.Push({
      "debug":true
    });
    push.register(function(token){
      console.log(token.token);
})

Response in Console:
Ionic Push: register

How can i see my device token?? Thanks!!!

Please have a look here

thank you very much,but i am using ionic v1 ?

how can i understand,i will set fcm_key a place gcm_key ?