---
title: "Changes to Create matter webhook subscription"
method: POST
path: "/matters/v1/{id}/events/subscriptions"
---

# Changes to Create matter webhook subscription

`POST /matters/v1/{id}/events/subscriptions`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 2 of 54 revisions.

- **2026-10-16** `a21d188f4b21`: 2 info
- **2026-03-28** `9579fb47836b`: 1 info

## Changes

- **2026-10-16** `a21d188f4b21`: 2 info
  - added the new optional `header` request parameter `Idempotency-Key`
  - added the non-success response with the status `400`
- **2026-03-28** `9579fb47836b`: 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/casemark/apis/case-dev-api/docs/matters/v1/:id/events/subscriptions/post.md) - [API](https://skmtc.dev/casemark/apis/case-dev-api.md) - [Page](https://skmtc.dev/casemark/apis/case-dev-api/changes/matters/v1/:id/events/subscriptions/post)