SKOUMAL

{
    "message": {
        "token": "<device_token>", // send push to particular device
        "channel": "<channel_id>", // or to channel
        "notification": {
            "title": "Hello baby!",
            "body": "This is my first notification ..."
        }
        "payload": { // (optional) invisible data for background processing
            "<custom_key1>": "<custom_value1>",
            "<custom_key2>": "<custom_value2>",
            "<custom_key3>": "<custom_value3>"
        }
    }
}