# Download Invoice PDF

Downloads an invoice as a PDF file.

Endpoint: GET /billing/invoices/{invoice_id}/download
Version: 1.0.0
Security: apiKeyAuth

## Path parameters:

  - `invoice_id` (string, required)
    The unique identifier of the invoice to download

## Header parameters:

  - `x-entity-id` (string)
    Optional entity ID for scoped access to entity-specific data

## Response 404 fields (application/json):

  - `message` (string)

  - `code` (integer)

## Response 422 fields (application/json):

  - `detail` (array)

  - `detail.loc` (array, required)

  - `detail.msg` (string, required)

  - `detail.type` (string, required)