toJson method
Implementation
Map<String, dynamic> toJson() {
return {
'notification': notification?.toJson(),
'data': data?.toJson(),
'android': android?.toJson(),
'apns': apns?.toJson(),
'token': token,
'webpush': webpush?.toJson(),
'topic': topic,
'condition': condition,
}..removeWhere((k, v) => v == null);
}