# Uploads voucher attachment files to blob storage before posting a voucher.

Endpoint: POST /api/v1/clients/{clientId}/voucher/attachments
Version: 1
Security: , , , 

## Path parameters:

  - `clientId` (string, required)
    The unique identifier of the client.

## Request fields (multipart/form-data):

  - `files` (array)
    The attachment files to upload (max 15MB per file).

## Response 200 fields (application/json):

  - `attachmentReference` (string)