toJson method
Implementation
@override
Map<String, dynamic> toJson() => <String, dynamic>{
'id': id,
'thumbnail_url': thumbnailUrl,
'sticker_url': stickerUrl,
'sticker_width': stickerWidth,
'sticker_height': stickerHeight,
'reply_markup': replyMarkup?.toJson(),
'input_message_content': inputMessageContent?.toJson(),
'@type': constructor,
};