Add customer ticket reply

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

Add a customer-visible reply to an open support ticket.

This is not an internal escalation, staff note, or private handoff endpoint; the message is appended to the customer conversation.

Use id from GET /api/v2/support/tickets data[].id.

Closed tickets must be reopened first.

Support Tickets

Authentication

Required API scope: write:support

Authenticate with an API key in the Authorization: Bearer <token> header.

Context

Path Parameters

id string required Example: tkt_01hxa3b4c5d6e7f8g9h0j1k2m3

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.

Headers

Authorization Bearer <token>
Accept application/json
Content-Type application/json

Body

required
application/json
message string required · Example: Here are the extra details you asked for.

Customer-visible reply body.

encrypted boolean · Example: false

Set true for sensitive replies. Defaults to false when omitted.

Responses

201 Created customer-visible ticket message.
id string required · Example: tmsg_01hxa3b4c5d6e7f8g9h0j1k2m3
ticketId string required · Example: tkt_01hxa3b4c5d6e7f8g9h0j1k2m3
sentAt string · nullable required · Example: 2026-04-27T12:00:00.000Z

body string · nullable required · Example: Here are the extra details you asked for.

sender string · enum required · Example: customer
customer
staff
automation
senderName string · nullable required · Example: Jane Example

encrypted boolean required · Example: false
attachments array<object> required · Example: []
400 Invalid request. The response body is an RFC 7807 Problem Details document.
type string · Example: https://developer.hostup.se/errors/invalid_request
title string · Example: Validation failed
status integer · Example: 400
detail string · Example: The request body failed validation.
code string · Example: invalid_request

Stable machine-readable code. Branch on this field, not on detail.

instance string · Example: /api/v2/orders
requestId string · Example: req_01hxa3b4c5d6e7f8g9h0j1k2m3
timestamp string · Example: 2026-04-27T12:34:56.000Z
errors array<object>

Field-level validation errors when code is invalid_request.

errors[].pointer string required · Example: /items/0/eppCode
errors[].detail string required · Example: `eppCode` is required for this transfer.
errors[].code string required · Example: missing_required
extensions object
401 Unauthorized. Authentication is required.
type string · Example: https://developer.hostup.se/errors/invalid_request
title string · Example: Validation failed
status integer · Example: 400
detail string · Example: The request body failed validation.
code string · Example: invalid_request

Stable machine-readable code. Branch on this field, not on detail.

instance string · Example: /api/v2/orders
requestId string · Example: req_01hxa3b4c5d6e7f8g9h0j1k2m3
timestamp string · Example: 2026-04-27T12:34:56.000Z
errors array<object>

Field-level validation errors when code is invalid_request.

errors[].pointer string required · Example: /items/0/eppCode
errors[].detail string required · Example: `eppCode` is required for this transfer.
errors[].code string required · Example: missing_required
extensions object
403 Forbidden. The caller lacks a required scope or does not own the resource.
type string · Example: https://developer.hostup.se/errors/invalid_request
title string · Example: Validation failed
status integer · Example: 400
detail string · Example: The request body failed validation.
code string · Example: invalid_request

Stable machine-readable code. Branch on this field, not on detail.

instance string · Example: /api/v2/orders
requestId string · Example: req_01hxa3b4c5d6e7f8g9h0j1k2m3
timestamp string · Example: 2026-04-27T12:34:56.000Z
errors array<object>

Field-level validation errors when code is invalid_request.

errors[].pointer string required · Example: /items/0/eppCode
errors[].detail string required · Example: `eppCode` is required for this transfer.
errors[].code string required · Example: missing_required
extensions object
404 Not found. The resource does not exist or is not owned by the caller.
type string · Example: https://developer.hostup.se/errors/invalid_request
title string · Example: Validation failed
status integer · Example: 400
detail string · Example: The request body failed validation.
code string · Example: invalid_request

Stable machine-readable code. Branch on this field, not on detail.

instance string · Example: /api/v2/orders
requestId string · Example: req_01hxa3b4c5d6e7f8g9h0j1k2m3
timestamp string · Example: 2026-04-27T12:34:56.000Z
errors array<object>

Field-level validation errors when code is invalid_request.

errors[].pointer string required · Example: /items/0/eppCode
errors[].detail string required · Example: `eppCode` is required for this transfer.
errors[].code string required · Example: missing_required
extensions object
429 Rate limited. Retry after the limit resets. 429 responses include Retry-After seconds plus X-RateLimit-* headers.
type string · Example: https://developer.hostup.se/errors/invalid_request
title string · Example: Validation failed
status integer · Example: 400
detail string · Example: The request body failed validation.
code string · Example: invalid_request

Stable machine-readable code. Branch on this field, not on detail.

instance string · Example: /api/v2/orders
requestId string · Example: req_01hxa3b4c5d6e7f8g9h0j1k2m3
timestamp string · Example: 2026-04-27T12:34:56.000Z
errors array<object>

Field-level validation errors when code is invalid_request.

errors[].pointer string required · Example: /items/0/eppCode
errors[].detail string required · Example: `eppCode` is required for this transfer.
errors[].code string required · Example: missing_required
extensions object
500 Internal error. Retry later or contact support if the issue persists.
type string · Example: https://developer.hostup.se/errors/invalid_request
title string · Example: Validation failed
status integer · Example: 400
detail string · Example: The request body failed validation.
code string · Example: invalid_request

Stable machine-readable code. Branch on this field, not on detail.

instance string · Example: /api/v2/orders
requestId string · Example: req_01hxa3b4c5d6e7f8g9h0j1k2m3
timestamp string · Example: 2026-04-27T12:34:56.000Z
errors array<object>

Field-level validation errors when code is invalid_request.

errors[].pointer string required · Example: /items/0/eppCode
errors[].detail string required · Example: `eppCode` is required for this transfer.
errors[].code string required · Example: missing_required
extensions object
POST https://cloud.hostup.se/api/v2/support/tickets/{id}/messages
For AI assistants
View as Markdown
cURL 
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."
  }'
Response 
{
  "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": []
}
Request Body Reply 
{
  "message": "Here are the extra details you asked for."
}