{
  "document": {
    "recipient": "Studio Sample → Demo Client",
    "reference": "Invoice INV-001 / Sample only",
    "date": "2026-10-13",
    "total": 1375
  },
  "lines": [
    {
      "description": "Design system workshop",
      "qty": 1,
      "price": 450,
      "amount": 450
    },
    {
      "description": "Interface layouts",
      "qty": 3,
      "price": 175,
      "amount": 525
    },
    {
      "description": "Document templates",
      "qty": 2,
      "price": 125,
      "amount": 250
    },
    {
      "description": "Project handoff",
      "qty": 1,
      "price": 150,
      "amount": 150
    }
  ]
}