toJson method
Implementation
@override
Map<String, dynamic> toJson([dynamic extra]) {
return {
"@type": CONSTRUCTOR,
"id": id,
"sender_user_id": senderUserId,
"currency": currency,
"total_amount": totalAmount,
"invoice_payload": invoicePayload,
"shipping_option_id": shippingOptionId,
"order_info": orderInfo?.toJson(),
};
}