{
  "output": "pdf",
  "language": "en",
  "currency": "GBP",
  "template": "classic",
  "number": "INV-2026-0001",
  "date": "2026-05-15",
  "due_date": "2026-06-14",
  "from": {
    "name": "Northwind Studio Ltd",
    "address": "21 Old Street\nLondon EC1V 9HL\nVAT GB123456789",
    "email": "billing@northwind.example"
  },
  "to": {
    "name": "Globex UK Ltd",
    "address": "4 Kings Road\nManchester M1 2AB"
  },
  "items": [
    { "description": "UX design retainer",   "quantity": 1,  "unit_price": 2400, "tax_rate": 20 },
    { "description": "Prototype build (hrs)", "quantity": 12, "unit_price": 95,   "tax_rate": 20 }
  ],
  "notes": "Payment due within 30 days.",
  "terms": "Net 30"
}