## POST /api/v2/support/tickets/{id}/messages

**Reply to support ticket**

Add a customer reply to an open support ticket. Use `id` from `GET /api/v2/support/tickets` `data[].id`. Closed tickets must be reopened first.

### Related Endpoints

- `GET /api/v2/support/tickets/{id}`: Get support ticket
- `POST /api/v2/support/tickets/{id}/actions/close`: Close support ticket
- `POST /api/v2/support/tickets/{id}/actions/reopen`: Reopen support ticket

### Headers

- `Accept`: application/json
- `Authorization`: Bearer YOUR_API_KEY
- Required API scope: `write:support`
- `Content-Type`: application/json

### Parameters

- `id` (path, string, required): Public support ticket ID. Get it from GET /api/v2/support/tickets `data[].id`. Numeric ticket numbers are accepted during migration. Do not invent this value; use the exact ID returned by the referenced API response. Example: `tkt_01hxa3b4c5d6e7f8g9h0j1k2m3`

### Request Body

- `message` (string, required) Example: `Here are the extra details you asked for.`
- `encrypted` (boolean, optional): Set true for sensitive replies. Defaults to false when omitted. Example: `false`

### Request Examples

#### Reply

```bash
curl -X POST "https://cloud.hostup.se/api/v2/support/tickets/tkt_01hxa3b4c5d6e7f8g9h0j1k2m3/messages" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Accept: application/json" \
  -H "Content-Type: application/json" \
  -d '{
    "message": "Here are the extra details you asked for."
  }'
```

```json
{
  "message": "Here are the extra details you asked for."
}
```

### Response Schema

- `id` (string, required) Example: `tmsg_01hxa3b4c5d6e7f8g9h0j1k2m3`
- `ticketId` (string, required) Example: `tkt_01hxa3b4c5d6e7f8g9h0j1k2m3`
- `sentAt` (string,null, required) Example: `2026-04-27T12:00:00.000Z`
- `body` (string,null, required) Example: `Here are the extra details you asked for.`
- `sender` (string, required) Example: `customer`
  Allowed values: customer, staff, automation
- `senderName` (string,null, required) Example: `Jane Example`
- `encrypted` (boolean, required) Example: `false`
- `attachments` (array<object>, required) Example: `[]`

### Responses

#### 201 - Created ticket message.
```json
{
  "id": "tmsg_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "ticketId": "tkt_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "sentAt": "2026-04-27T12:00:00.000Z",
  "body": "Here are the extra details you asked for.",
  "sender": "customer",
  "senderName": "Jane Example",
  "encrypted": false,
  "attachments": []
}
```

#### 400 - Invalid request. The response body is an RFC 7807 Problem Details document.
```json
{
  "type": "https://developer.hostup.se/errors/invalid_request",
  "title": "Invalid request",
  "status": 400,
  "detail": "The request body failed validation.",
  "code": "invalid_request",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z",
  "errors": [
    {
      "pointer": "/items/0/domainName",
      "detail": "`domainName` is required.",
      "code": "invalid_request"
    }
  ]
}
```

#### 401 - Unauthorized. Authentication is required.
```json
{
  "type": "https://developer.hostup.se/errors/unauthorized",
  "title": "Unauthorized",
  "status": 401,
  "detail": "Authentication is required.",
  "code": "unauthorized",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 403 - Forbidden. The caller lacks a required scope or does not own the resource.
```json
{
  "type": "https://developer.hostup.se/errors/forbidden",
  "title": "Forbidden",
  "status": 403,
  "detail": "The caller lacks a required scope or does not own the resource.",
  "code": "forbidden",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 404 - Not found. The resource does not exist or is not owned by the caller.
```json
{
  "type": "https://developer.hostup.se/errors/not_found",
  "title": "Not found",
  "status": 404,
  "detail": "The requested resource could not be found.",
  "code": "not_found",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 429 - Rate limited. Retry after the limit resets. 429 responses include `Retry-After` seconds plus `X-RateLimit-*` headers.
```json
{
  "type": "https://developer.hostup.se/errors/rate_limit_exceeded",
  "title": "Too many requests",
  "status": 429,
  "detail": "Too many requests. Retry after the limit resets.",
  "code": "rate_limit_exceeded",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 500 - Internal error. Retry later or contact support if the issue persists.
```json
{
  "type": "https://developer.hostup.se/errors/internal_error",
  "title": "Internal server error",
  "status": 500,
  "detail": "An unexpected error occurred. Retry later or contact support if the issue persists.",
  "code": "internal_error",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```