Does Pushy support the FCM notification parameter on Android?

At this time, Pushy only supports data-payload notifications to Android devices, which are silent by default:

{
    "to": "a6345d0278adc55d3474f5",
    "data": {
        "message": "Hello World!"
    }
}

The Pushy Android SDK delivers the data payload to your push BroadcastReceiver, which lets you execute native code to handle the incoming notification payload, and possibly display a visible system notification to the user if you wish.