Returns a list of invoices (bill headers) for the authenticated account.

All query parameters are optional. Omitting them returns all invoices ordered by invoice date descending.

Filtering

• Date range: use date_from and/or date_to (format: YYYY-MM-DD)
• Payment status: paid (settled), unpaid (outstanding), or all (default)
• Invoice type: vegszamla (final invoice), dijbekero (proforma / payment request), sztorno (cancellation), or all (default)
• Currency: HUF, EUR, USD, or all (default)

Line Items

This endpoint returns invoice headers only. To retrieve the individual line items
for a specific invoice, use GET /invoices/{invoiceId}.