toJson method
Implementation
@override
Map<String, dynamic> toJson() => <String, dynamic>{
'id': id,
'restrict_user_is_bot': restrictUserIsBot,
'user_is_bot': userIsBot,
'restrict_user_is_premium': restrictUserIsPremium,
'user_is_premium': userIsPremium,
'max_quantity': maxQuantity,
'request_name': requestName,
'request_username': requestUsername,
'request_photo': requestPhoto,
'@type': constructor,
};