InvoiceLine

{
    "name": "Webentwicklung",
    "description": "Implementierung und Review",
    "quantity": 10,
    "unit_code": "HUR",
    "price": 100,
    "tax_rate": 19,
    "service_period_start": "2026-04-01T00:00:00.000Z",
    "service_period_end": "2026-04-30T00:00:00.000Z"
}