# Submit an invoice file

**POST /order/{orderNumber}/invoice/{invoiceNumber}**

Upload an invoice PDF (or similar) for an order.

If this is the **first** invoice submitted for the order and the shop is configured to send invoices by letter post, this call may also trigger Komfortkasse to send the invoice to the customer as a physical letter. Do not call this multiple times for the same `invoiceNumber` — repeat uploads of an existing invoice file are silently ignored, but you should still treat the call as non-idempotent for triggering side effects.


## Servers
- Production: https://ssl.komfortkasse.eu/api/v2 (Production)


## Authentication methods
- Api key


## Parameters

### Path parameters
- **orderNumber** (string)
  Order number (unique per shop).
- **invoiceNumber** (string)
  Invoice number.


### Body: multipart/form-data (object)

- **file** (string(binary))
  Invoice file (PDF).


## Responses
### 200
Invoice file accepted.

### 400
Invalid request — for example missing required fields or wrong format.

#### Body: application/json (object)
- **error** (string)
  Error message.

### 401
Authentication failed — API key missing or invalid.

#### Body: application/json (object)
- **error** (string)
  Error message.

### 404
Resource not found (e.g. unknown order number).

#### Body: application/json (object)
- **error** (string)
  Error message.


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