---
title: "Changes to Send conversation message"
method: POST
path: "/conversations/{conversationId}/messages"
---

# Changes to Send conversation message

`POST /conversations/{conversationId}/messages`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 5 of 149 revisions.

- **2026-10-16** `db3873ca3d4d`: 1 warning, 12 info
- **2026-08-19** `ba3a29c6eb33`: 4 info
- **2026-08-16** `6fd2903b91ce`: 4 info
- **2026-08-02** `36f92fc0caa2`: 4 breaking
- **2026-06-11** `ad2d3114269a`: 1 info

## Changes

- **2026-10-16** `db3873ca3d4d`: 1 warning, 12 info
  - added the new `system` enum value to the `message/type` response property for the response status `200`
  - added the new optional request property `attachments`
  - added the new optional request property `senderProfileId`
  - added the non-success response with the status `503`
  - added the optional property `issues` to the response with the `400` status
  - added the optional property `issues` to the response with the `401` status
  - added the optional property `issues` to the response with the `404` status
  - added the optional property `issues` to the response with the `500` status
  - added the optional property `message/attachments/items/downloadUrl` to the response with the `200` status
  - added the optional property `message/attachments/items/s3Key` to the response with the `200` status
  - added the required property `message/attachments/items/contentType` to the response with the `200` status
  - added the required property `message/attachments/items/filename` to the response with the `200` status
  - added the required property `message/attachments/items/size` to the response with the `200` status
- **2026-08-19** `ba3a29c6eb33`: 4 info
  - added the optional property `retryable` to the response with the `400` status
  - added the optional property `retryable` to the response with the `401` status
  - added the optional property `retryable` to the response with the `404` status
  - added the optional property `retryable` to the response with the `500` status
- **2026-08-16** `6fd2903b91ce`: 4 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
  - added the optional property `code` to the response with the `500` status
- **2026-08-02** `36f92fc0caa2`: 4 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`
  - the response property `success` became optional for the status `500`
- **2026-06-11** `ad2d3114269a`: 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/sequenzy/apis/sequenzy-api/docs/conversations/:conversationId/messages/post.md) - [API](https://skmtc.dev/sequenzy/apis/sequenzy-api.md) - [Page](https://skmtc.dev/sequenzy/apis/sequenzy-api/changes/conversations/:conversationId/messages/post)