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

# Reply to a ticket

> Adds your reply, attaches up to 5 pending uploads, and sets the ticket to CUSTOMER_REPLY. A message may be empty only when it
carries files. Closed tickets refuse replies (400). Staff are alerted by email and Telegram. 409 if an attachment is no
longer pending.



## OpenAPI

````yaml /api-reference/openapi.yaml post /v1/client/tickets/{id}/messages
openapi: 3.1.0
info:
  title: Server.Express API
  version: 1.0.0
  description: >-
    The customer-facing Server.Express API: auth, billing, tickets, cloud and
    dedicated servers, hosting, reselling and account management. Every response
    uses the `{ success, data | error }` envelope.
  contact:
    name: Server.Express
    url: https://server.express
servers:
  - url: https://my.server.express/api
    description: Production
security:
  - bearerAuth: []
  - apiToken: []
tags:
  - name: API Tokens
  - name: Account
  - name: Auth
  - name: Cloud
  - name: Coupons
  - name: Credits
  - name: Dashboard
  - name: Dedicated
  - name: Health
  - name: Hosting
  - name: Integrations
  - name: Invoices
  - name: Livechat
  - name: Notifications
  - name: Passkeys
  - name: Payments
  - name: Products
  - name: Public
  - name: Public Invoices
  - name: Public Tools
  - name: Reseller
  - name: SSH Keys
  - name: Services
  - name: Tasks
  - name: Teams
  - name: Tickets
  - name: Web Hosting
  - name: Webhooks
paths:
  /v1/client/tickets/{id}/messages:
    post:
      tags:
        - Tickets
      summary: Reply to a ticket
      description: >-
        Adds your reply, attaches up to 5 pending uploads, and sets the ticket
        to CUSTOMER_REPLY. A message may be empty only when it

        carries files. Closed tickets refuse replies (400). Staff are alerted by
        email and Telegram. 409 if an attachment is no

        longer pending.
      operationId: publicClientReplyToTicket
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                body:
                  type: string
                  description: Required unless attachmentIds is non-empty.
                attachmentIds:
                  type: array
                  maxItems: 5
                  items:
                    type: string
                    format: uuid
      responses:
        '200':
          description: Reply added.
          content:
            application/json:
              schema:
                type: object
                required:
                  - success
                  - data
                properties:
                  success:
                    type: boolean
                    const: true
                  data:
                    $ref: '#/components/schemas/PublicClientTicketMessage'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
        '409':
          $ref: '#/components/responses/Conflict'
        '500':
          $ref: '#/components/responses/ServerError'
      security:
        - bearerAuth: []
        - apiToken: []
components:
  schemas:
    PublicClientTicketMessage:
      type: object
      required:
        - id
        - author
        - role
        - body
        - createdAt
        - attachments
      properties:
        id:
          type: string
        author:
          type: string
          description: Display name — a staff alias when one was used.
        role:
          type: string
          enum:
            - staff
            - client
        body:
          type: string
        createdAt:
          type: string
          format: date-time
        attachments:
          type: array
          items:
            $ref: '#/components/schemas/PublicClientAttachment'
    PublicClientAttachment:
      type: object
      required:
        - id
        - filename
        - contentType
        - size
        - inline
      properties:
        id:
          type: string
          format: uuid
        filename:
          type: string
        contentType:
          type: string
        size:
          type: integer
          description: Bytes.
        inline:
          type: boolean
          description: Images and PDFs open in the browser; everything else downloads.
    ErrorResponse:
      type: object
      required:
        - success
        - error
      properties:
        success:
          type: boolean
          const: false
        error:
          type: string
          description: Human-readable error message.
      additionalProperties: true
  responses:
    BadRequest:
      description: Validation failed or the request is malformed.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    Unauthorized:
      description: Missing, invalid or expired credentials.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    Forbidden:
      description: >-
        Authenticated but not allowed (missing scope, not an admin, or not your
        resource).
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    NotFound:
      description: The resource doesn't exist or isn't visible to you.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    Conflict:
      description: The request conflicts with the resource's current state.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    ServerError:
      description: Unexpected server error.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: >-
        Session access token (JWT) from POST /v1/auth/login or /v1/auth/refresh.
        A session satisfies every API scope.
    apiToken:
      type: http
      scheme: bearer
      bearerFormat: se_live_<prefix>_<secret>
      description: >-
        Personal API token created under Settings → API tokens. Only routes
        guarded by verifyApiAuth accept it, and the token must carry the scope
        named in the operation's x-required-scope.

````

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