unpaidInvoiceOf method
Implementation
UHotelInvoiceResponse? unpaidInvoiceOf(UHotelReservationResponse i) {
final List<UHotelInvoiceResponse> invoices = i.invoices ?? <UHotelInvoiceResponse>[];
for (final UHotelInvoiceResponse inv in invoices) {
if (!inv.isPaid) return inv;
}
return null;
}