Notifications.js

// Push Notifications constants
let baseNotification =  new firebase.notifications.Notification({
    sound: 'default',
    show_in_foreground: true,
})
    .setSound("default")
    .android.setChannelId('channelId') // id you have set in HandleNotifications.js
    .android.setColor('#ffffff') // you can set a color here
    .android.setPriority(firebase.notifications.Android.Priority.High)
    .android.setSmallIcon('ic_launcher')
    .android.setAutoCancel(true);

// notification actions
const takenAction = new firebase.notifications.Android.Action('medicine_taken', 'default', 'Taken');
const snoozAction = new firebase.notifications.Android.Action('snooz', 'default', '30 min Later');

// creating notification
const bigText = "Please take Medicine on time. Have you already taken it?";
baseNotification
    .setNotificationId('reminder')
    .setTitle('Reminder')
    .setBody(bigText)
    .setData({medicineId: '2'})
    .android.addAction(takenAction) // adding 
    .android.addAction(snoozAction); // snoozing

const schedule = {
    fireDate: new Date().getTime(),
};

// scheduling notifications
firebase.notifications().scheduleNotification(baseNotification, schedule);