firebase cloud messaging admin send push notification

fcm-push-admin.js

// full project with vue: https://github.com/benixal/vue-firebase-push-notification

var admin = require("firebase-admin");

var serviceAccount = require("./your-private-key.json");

admin.initializeApp({
  credential: admin.credential.cert(serviceAccount)
});
// This registration token comes from the client FCM SDKs.
const registrationToken = 'cJJ0pXh6KaXu33xeT7pvwD:APA91bFdbv8X6sBxCYIotAulW17OuGapviqI4y3nb4UB_9nGoYv2pE_RakTZQqcC8d99mS-vPjPJzaHmV4cIsbkN2nkTX-IJe3y0fnW2YNw3RZR72xoNhcS4FOTnDLp6gthRvWUKh9Th';

const message = {
   notification: {
    title: "I am Admin",
    body: "Hi client"
   },
   webpush: {
    fcmOptions: {
      link: '/?breakingnews'
    }
  },
  token: registrationToken
};

// Send a message to the device corresponding to the provided
// registration token.
admin.messaging().send(message)
  .then((response) => {
    // Response is a message ID string.
    console.log('Successfully sent message:', response);
  })
  .catch((error) => {
    console.log('Error sending message:', error);
  });