---
title: "Create subscriber note by external ID"
method: POST
path: "/subscribers/external/notes"
tags: ["Subscribers"]
---

# Create subscriber note by external ID

`POST /subscribers/external/notes`

Creates an internal note for a subscriber identified by customer-owned external ID.

## Query parameters

- `externalId` string, required

## Request body

- object
  - `body` string, required — Internal note body.

## Response `200`

Subscriber note created

- object
  - `success` boolean
  - `note` SubscriberNote
    - `id` string
    - `companyId` string
    - `subscriberId` string
    - `authorId` string
    - `body` string
    - `createdAt` string, date-time
    - `updatedAt` string, date-time
    - `author` object, nullable
      - `id` string
      - `name` string, nullable
      - `email` string, nullable

## Other responses

- `400` — Missing external ID or invalid note body
- `401` — Unauthorized
- `404` — Subscriber not found

## Changes

> 121 revisions in range; 10 could not be searched.

- **2026-08-16** `6fd2903b91ce` — 3 info
  - added the optional property `code` to the response with the `400` status
  - added the optional property `code` to the response with the `401` status
  - added the optional property `code` to the response with the `404` status
- **2026-08-02** `36f92fc0caa2` — 3 breaking
  - the response property `success` became optional for the status `400`
  - the response property `success` became optional for the status `401`
  - the response property `success` became optional for the status `404`
- **2026-06-29** `34f108902017` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/sequenzy/apis/sequenzy-api/changes/subscribers/external/notes/post.md)

---

[API](https://skmtc.dev/sequenzy/apis/sequenzy-api.md) · [All operations](https://skmtc.dev/sequenzy/apis/sequenzy-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/sequenzy/sequenzy-api/revisions/73f826277d9a/schema)