{
"clientId": "string",
"date": "string",
"dueDate": "string",
"currency": "USD",
"prefix": "string",
"invoiceNumber": 0,
"lineItems": [
{
"id": "123e4567-e89b-12d3-a456-426614174000",
"type": "GOODS",
"description": "Premium Widget",
"price": 100,
"quantity": 2,
"unit": "pieces",
"sortOrder": 1,
"taxId": "string"
}
]
}