toJson method
Implementation
@override
Map<String, dynamic> toJson() => <String, dynamic>{
'owner_id': ownerId?.toJson(),
'currency': currency,
'total_amount': totalAmount,
'invoice_payload': invoicePayload,
'telegram_payment_charge_id': telegramPaymentChargeId,
'provider_payment_charge_id': providerPaymentChargeId,
'@type': constructor,
};