toJson method
Implementation
@override
Map<String, dynamic> toJson() => <String, dynamic>{
'input_invoice': inputInvoice?.toJson(),
'payment_form_id': paymentFormId,
'order_info_id': orderInfoId,
'shipping_option_id': shippingOptionId,
'credentials': credentials?.toJson(),
'tip_amount': tipAmount,
'@type': constructor,
};