toJson method
Implementation
@override
Map<String, dynamic> toJson() => <String, dynamic>{
'chat_id': chatId,
'topic_id': topicId?.toJson(),
'reply_to': replyTo?.toJson(),
'options': options?.toJson(),
'reply_markup': replyMarkup?.toJson(),
'input_message_content': inputMessageContent?.toJson(),
'@type': constructor,
};