Answers for "firebase cloud messaging Unknown name "sound" at 'message.notification':"

firebase cloud messaging Unknown name "sound" at 'message.notification':

{
    "message": {
        "token": "your-token-value",
        "notification": {
            "title": "Test",
            "body": "Test message from server"
        },
        "android": {
            "notification": {
                "sound": "default"
            }
        },
        "apns": {
            "payload": {
                "aps": {
                    "sound": "default"
                }
            }
        }
    }
}