You should mark yourself as a correct answer.
On a sidenote, if you do send a Notification and a Data payload, use
"notification":{
"sound":"default"
}
This will play the sound when the application is in background and the device is set to sound, and it will play a vibration if the device is set to vibrate.
However, as far as customization goes I think you need to use the Data Payload only if you want to customize the vibration pattern for example.
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