toJson method
Implementation
@override
Map<String, dynamic> toJson() => <String, dynamic>{
'invoice': invoice?.toJson(),
'title': title,
'description': description,
'photo_url': photoUrl,
'photo_size': photoSize,
'photo_width': photoWidth,
'photo_height': photoHeight,
'payload': payload,
'provider_token': providerToken,
'provider_data': providerData,
'start_parameter': startParameter,
'paid_media': paidMedia?.toJson(),
'paid_media_caption': paidMediaCaption?.toJson(),
'@type': constructor,
};