FCM

fcm-notification-sender-notification-type.json

{
    "to" : "bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
    "notification" : {
      "body" : "great match!",
      "title" : "Portugal vs. Denmark",
      "icon" : "myicon"
    }
  }

FCM-Notification-Sender-Topic.json

https://fcm.googleapis.com/fcm/send
Content-Type:application/json
Authorization:key=AIzaSyZ-1u...0GBYzPu7Udno5aA

{
  "to": "/topics/foo-bar",
  "data": {
    "message": "This is a Firebase Cloud Messaging Topic Message!",
   }
}

//send multi topics

https://fcm.googleapis.com/fcm/send
Content-Type:application/json
Authorization:key=AIzaSyZ-1u...0GBYzPu7Udno5aA

{
  "condition": "'dogs' in topics || 'cats' in topics",
  "data": {
    "message": "This is a Firebase Cloud Messaging Topic Message!",
   }
}

//HTTP Response
//Success example:
{
  "message_id": "1023456"
}

//failure example:
{
  "error": "TopicsMessageRateExceeded"
}

pushNotificationAPPTopic.js

pushNotificationAPPTopic: function (param) {
        var request = require('request');

        var full_url = "https://fcm.googleapis.com/fcm/send";

        param = {
            "to": "/topics/news",
            "data": {
                'Subject': param.subject,
                'Image': param.image,
                'Content': param.content
            }
        };

        console.log("url:" + full_url);
        console.dir(param);

        request.post({
            uri: full_url,
            body: param,
            headers: {
                'content-type': 'application/json',
                'Authorization': 'key=AIzaSyAVwjj...otJUrI'
            },
            json: true
        }, function (err, response, body) {
            if (err) { 
                console.log(err)
            } else {
                console.log(body);
            }

        });

    }