---
title: "Unified Send Message"
method: POST
path: "/v1/messages/send"
tags: ["Unified Agent APIs"]
---

# Unified Send Message

`POST /v1/messages/send`

Unified messaging.

Send a message via SMS or WhatsApp. Default channel is 'auto', which sends
via SMS. Set channel='whatsapp' to use WhatsApp explicitly.

**WhatsApp opt-in requirement:** WhatsApp Business API only delivers
free-form messages to recipients who have messaged your Business number
within the last 24 hours. Without prior opt-in, Meta accepts the API call
and returns a message ID, but silently drops the message. SMS has no such
restriction and delivers reliably.

## Request body

- AppApiUnifiedMessagesSendMessageRequest
  - `to` string, required
  - `message` string, required
  - `channel` string, nullable
  - `from_number` string, nullable

## Response `200`

Successful Response

- unknown

## Other responses

- `422` — Validation Error

---

[API](https://skmtc.net/suprsonic/apis/suprsonic-unified-agent-api.md) · [All operations](https://skmtc.net/suprsonic/apis/suprsonic-unified-agent-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/suprsonic/suprsonic-unified-agent-api/revisions/2a1b6fcb4ef0/schema)