curl --request POST \
  --url https://{operatorDomain}/v1/admin/finance/invoices/{id}/convert-to-invoice \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "inv_01HZX...",
    "invoiceNumber": "2026-000123",
    "bookingId": "bkg_01HZX...",
    "status": "issued",
    "currency": "EUR",
    "totalCents": 119000,
    "personId": "<string>",
    "organizationId": "<string>",
    "kind": "fiscal",
    "baseCurrency": "<string>",
    "subtotalCents": 100000,
    "taxCents": 19000,
    "paidCents": 0,
    "balanceDueCents": 119000,
    "commissionPercent": 123,
    "commissionAmountCents": 123,
    "issueDate": "2026-06-17",
    "dueDate": "2026-07-17",
    "notes": "<string>"
  }
}