{
  "number": "FV/2026/08/001",
  "issueDate": "2026-08-28",
  "dueDate": "2026-09-11",
  "currency": "PLN",
  "seller": {
    "name": "Vulp Sp. z o.o.",
    "address": "ul. Przykladowa 1, 00-001 Warszawa",
    "taxId": "PL1234567890",
    "email": "billing@vulp.example"
  },
  "buyer": {
    "name": "Acme Corp",
    "address": "ul. Klienta 5, 30-001 Krakow",
    "taxId": "PL9876543210"
  },
  "paymentTerms": "14 days, transfer",
  "notes": "Thank you for your business.",
  "lines": [
    {"description": "Consulting hours", "quantity": 12, "unitPrice": 150.0, "vat": 23, "unit": "h"},
    {"description": "Annual software license", "quantity": 2, "unitPrice": 500.0, "vat": 23, "discount": 0.1},
    {"description": "Printed manual", "quantity": 4, "unitPrice": 25.0, "vat": 5, "unit": "pcs"}
  ]
}