title: Firebase Admin sends notification to another service account in nodejs
body: <p>I have two routes in nodejs. 
  One is like this, one.js </p>
  
  <pre><code>var admin = require("firebase-admin");
  var topic = "/topics/news";
  
  var serviceAccount = require("/path/serice-1-firebase-adminsdk.json");
  
  var firebase = admin.initializeApp({
    credential: admin.credential.cert(serviceAccount),
    databaseURL: "https://service-1-database.firebaseio.com/"
  });
  
  console.log(firebase.name);
  </code></pre>
  
  <p>Then I am sending the notification like this</p>
  
  <pre><code>router.post('/', function(req, res) {
    var payload = {
      data: {
        title: req.body.title,
        message: req.body.message
      }
    };
    admin.messaging().sendToDevice(topic, payload)
      .then(function(response) {
  
        console.log("value of topic ", topic);
        console.log("Successfully sent message:", response);
      })
      .catch(function(error) {
        console.log("Error sending message:", error);
      });
  
  });
  </code></pre>
  
  <p>And in another route, two.js, I am doing this</p>
  
  <pre><code>var admin = require("firebase-admin");
  var topic = "/topics/news";
  var serviceAccount = require("path/service-2-firebase-adminsdk.json");
  
  var firebase = admin.initializeApp({
    credential: admin.credential.cert(serviceAccount),
    databaseURL: "https://service-2-database.firebaseio.com"
  },"other");
  console.log(firebase.name);
  </code></pre>
  
  <p>Then again I am sending the notification like this</p>
  
  <pre><code>router.post('/notify',function(req,res){
    var category = req.body.category;
  
        var payload = {
          data: {
            title: "title",
            message: "desc"
          }
        };
  
  
        admin.messaging().sendToDevice(topic, payload)
          .then(function(response) {
            console.log("value of topic ", topic);
            console.log("Successfully sent message:", response);
          })
          .catch(function(error) {
            console.log("Error sending message:", error);
          });
  
  });
  </code></pre>
  
  <p>When I try to send the notification using two.js for service-2, the notification gets sent for service-1 but the service account for two is service-2. What am I missing?</p>