{
  "Cashier": "Software QA Engineer",
  "buyerId": "DT12345",
  "BuyerCostCenterId": "Data Tech",
  "InvoiceNumber": "DEMO-2025-AS1",
  "DateAndTimeOfIssue": "2025-08-11T09:17:28+12:00",
  "invoiceType": "Advance",
  "transactionType": "Sale",
  "payment": [{"amount": 400, "paymentType": "Cash"}],
  "Options": { "omitTextualRepresentation": 1, "omitQRCodeGen": 1 },
  "Items": [{"Name":"Advance payment 1","Quantity":1,"UnitPrice":400,"Labels":["A"],"TotalAmount":400}]
}