---
title: "Changes to Send an RCS message"
method: POST
path: "/messages/rcs"
---

# Changes to Send an RCS message

`POST /messages/rcs`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 1 of 89 revisions.

- **2026-10-21** `45ac44d8caea`: 4 info

## Changes

- **2026-10-21** `45ac44d8caea`: 4 info
  - added the new optional `header` request parameter `Idempotency-Key`
  - added the non-success response with the status `409`
  - added the non-success response with the status `413`
  - added the non-success response with the status `503`

---

[Operation](https://skmtc.dev/team-telnyx/apis/telnyx-api/docs/messages/rcs/post.md) - [API](https://skmtc.dev/team-telnyx/apis/telnyx-api.md) - [Page](https://skmtc.dev/team-telnyx/apis/telnyx-api/changes/messages/rcs/post)