title: JSON Data to send Push Notification to all of the registered devices using Firebase
body: <p>This is the JSON structure when I need to send the notification to specific device using Firebase. So how should I modify it to send the same notification to all of the devices or couple of selected devices?</p>
  
  <pre><code>{ "notification": {
      "title": "Quiz App",
      "text": "Your Quiz has submitted Successfully."
    },
    "to" : "Unique Key"
  }
  </code></pre>
  
  <p>What will be the JSON structure for sending the push notification to all of the devices using Firebase in android?</p>