You can use a custom sound for your push notifications when creating an Ionic 3 app. It’s quite simple:

  1. Create a mp3 file with the custom sound
  2. Add the sound to platforms/android/app/src/main/res/raw (if the raw folder does not exist, create it)
  3. In your payload that send the notification add sound: filename (without filetype ending) to the notification item

Now your app will play the custom notification sound in Ionic 3.