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

# Reply to Comment

> Reply to a specific comment on a post.

## Overview

Reply to a specific comment on a post. This creates a threaded reply under the target comment.

<Note>This endpoint consumes **1 credit** per request. Ignore this if you're on per-seat pricing: usage is unlimited.</Note>

<Note>The `tracking_id`, `profile_urn`, and `comment_urn` values can be obtained from the [Get Post Comments](/api-reference/v2/content/get-comments) response.</Note>

## Request

<ParamField header="x-api-key" type="string" required>
  Your API key for authentication.
</ParamField>

<ParamField body="account_id" type="string" required>
  The unique identifier of the account to use.
</ParamField>

<ParamField body="action" type="string" required>
  Must be `"answer_comment"`.
</ParamField>

<ParamField body="params" type="object" required>
  <Expandable title="params properties">
    <ParamField body="tracking_id" type="string" required>
      The tracking ID associated with the post. Obtained from the `get_comments` response.
    </ParamField>

    <ParamField body="profile_urn" type="string" required>
      The URN of the profile that owns the post. Obtained from the `get_comments` response.
    </ParamField>

    <ParamField body="comment_urn" type="string" required>
      The URN of the comment to reply to. Obtained from the `get_comments` response.
    </ParamField>

    <ParamField body="comment_text" type="string" required>
      The text content of the reply.
    </ParamField>

    <ParamField body="mention_user" type="boolean" default="false">
      Whether to mention the original commenter in the reply. Default is `false`.
    </ParamField>

    <ParamField body="commenter_name" type="string">
      The name of the original commenter. Used when `mention_user` is `true` to format the mention.
    </ParamField>
  </Expandable>
</ParamField>

## Response

<ResponseField name="success" type="boolean">
  Indicates whether the request was successful.
</ResponseField>

<ResponseField name="data" type="object">
  Confirmation of the reply action.

  <Expandable title="data properties">
    <ResponseField name="comment_urn" type="string">
      Unique identifier of the created reply. Treat it as an opaque string and pass it back exactly as returned.
    </ResponseField>
  </Expandable>
</ResponseField>

<ResponseField name="metadata" type="object">
  <Expandable title="metadata properties">
    <ResponseField name="action" type="string">
      The action that was performed (`"answer_comment"`).
    </ResponseField>

    <ResponseField name="account_id" type="string">
      The account ID used for the request.
    </ResponseField>

    <ResponseField name="credits_consumed" type="integer">
      Number of credits consumed (1).
    </ResponseField>

    <ResponseField name="timestamp" type="string">
      ISO 8601 timestamp of the response.
    </ResponseField>
  </Expandable>
</ResponseField>

<ResponseExample>
  ```json 200 theme={null}
  {
    "success": true,
    "data": {
      "comment_urn": "urn:li:comment:(activity:7654321098765432100,7654321098765432102)"
    },
    "metadata": {
      "action": "answer_comment",
      "account_id": "your-account-id",
      "credits_consumed": 1,
      "timestamp": "2026-03-24T12:00:00Z"
    }
  }
  ```

  ```json 400 theme={null}
  {
    "success": false,
    "error": {
      "code": "INVALID_PARAMS",
      "message": "tracking_id, profile_urn, comment_urn, and comment_text are required."
    },
    "metadata": {
      "action": "answer_comment",
      "account_id": "your-account-id",
      "credits_consumed": 0,
      "timestamp": "2026-03-24T12:00:00Z"
    }
  }
  ```
</ResponseExample>