---
title: "Add case comment"
method: POST
path: "/v1/transaction_monitoring/cases/{case_token}/comments"
tags: ["Transaction Monitoring"]
---

# Add case comment

`POST /v1/transaction_monitoring/cases/{case_token}/comments`

Adds a comment to a case.

## Path parameters

- `case_token` string, uuid, required

## Request body

- AddCommentRequest — Parameters for adding a comment to a case
  - `comment` string, required — Text of the comment
  - `actor_token` string — Optional client-provided identifier for the actor performing this action, recorded on the resulting activity entry. This value is supplied by the client (for example, your own internal user ID) and is not authenticated by Lithic

## Response `201`

Case activity entry

- CaseActivity — A single entry in a case's activity feed
  - `token` string, uuid, required — Globally unique identifier for the activity entry
  - `entry_type` 'STATUS' | 'TITLE' | 'ASSIGNED_TO' | 'RESOLUTION_OUTCOME' | 'RESOLUTION_NOTES' | 'TAGS' | 'PRIORITY' | 'COMMENT' | 'FILE', required — The case field that changed, or the action that was taken, in an activity entry: - `STATUS` - The case status changed - `TITLE` - The case title changed - `ASSIGNED_TO` - The case assignee changed - `RESOLUTION_OUTCOME` - The resolution outcome was set or changed - `RESOLUTION_NOTES` - The resolution notes were set or changed - `TAGS` - The case tags changed - `PRIORITY` - The case priority changed - `COMMENT` - A comment was added or edited - `FILE` - A file was attached to the case
  - `actor_token` string, nullable, required — Identifier of the actor that produced the activity entry
  - `previous_value` string, nullable, required — Previous value of the changed field, when applicable
  - `new_value` string, nullable, required — New value of the changed field, when applicable
  - `created` string, date-time, required — Date and time at which the activity entry was created

## Other responses

- `400` — Bad Request
- `404` — Not Found

## Changes

- **2026-06-10** `1c39edadd1a4` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/lithic-com/apis/lithic-developer-api/changes/v1/transaction_monitoring/cases/:case_token/comments/post.md)

---

[API](https://skmtc.dev/lithic-com/apis/lithic-developer-api.md) · [All operations](https://skmtc.dev/lithic-com/apis/lithic-developer-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/lithic-com/lithic-developer-api/revisions/53ab5d4e2adb/schema)