> ## Documentation Index
> Fetch the complete documentation index at: https://woku.app/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Add an optional voice review to an NPS score



## OpenAPI

````yaml /openapi-v1.json post /v1/nps/{id}/voicemails
openapi: 3.0.0
info:
  title: Woku Client API v1
  description: >-
    Public REST API for programmatic management of woku Voice-of-Customer
    programs: trackers, VoC instruments (NPS, woku, CES, CSAT), action plans,
    support tickets, multi-channel sending and response capture. Requests are
    company-scoped by the API key; never send a company id.
  version: 1.0.0
  contact:
    name: Woku
    url: https://woku.app
    email: team@woku.app
servers:
  - url: https://clientapi.woku.app
    description: Production
security: []
tags: []
paths:
  /v1/nps/{id}/voicemails:
    post:
      tags:
        - v1 - nps
      summary: Add an optional voice review to an NPS score
      operationId: V1NpsController_addNpsVoicemail
      parameters:
        - name: id
          required: true
          in: path
          schema:
            type: string
            format: ObjectId
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
              properties:
                file:
                  type: string
                  format: binary
                  description: Audio file (m4a/aac/mp4). Transcribed server-side.
                language:
                  type: string
                  enum:
                    - es
                    - en
                  description: Spoken language used for transcription
              required:
                - file
                - language
      responses:
        '201':
          description: Voice review added
        '403':
          description: NPS does not belong to caller
        '404':
          description: NPS not found
      security:
        - bearer: []
components:
  securitySchemes:
    bearer:
      scheme: bearer
      bearerFormat: API key
      type: http
      description: Company secret API key.

````