Send a message

POST/conversations/{conversationId}/messages

Sends a text or file message as your app user. Set reply_to_message_id to reply in a thread.

Scope messages:write · Idempotent with Idempotency-Key

Path parameters

conversationIdUUIDRequired

ID of the conversation.

Headers

Idempotency-KeyUUIDRequired

A UUID you generate for each write. Retrying with the same key returns the original result for 24 hours. Reusing a key with a different method, path, or body returns 409.

Body parameters

Provide exactly one of body or file_id.

bodystring

Message text, up to 10,000 characters.

file_idUUID

ID of a file already uploaded to BloomText. Mutually exclusive with body.

reply_to_message_idUUID or null

Set to reply in a thread.

Returns

Returns 201 Created with the Message object.

Errors

Failed requests return application/problem+json problem details. The errors specific to this endpoint:

Status	Code	Meaning
400	`invalid_request`	The request is malformed, such as invalid JSON.
401	`unauthorized`	The API key is missing, revoked, or invalid.
403	`insufficient_scope`	The key lacks the required scope.
403	`conversation_membership_required`	Your app user is not a participant in this conversation.
404	`not_found`	The resource doesn’t exist or isn’t visible to this key.
409	`idempotency_key_reused`	The Idempotency-Key was already used with a different request.
422	`validation_failed`	A field failed validation. See `field_errors`.
429	`rate_limited`	Too many requests. Retry after `Retry-After` seconds.

cURL

Request


curl -X POST "https://api.bloomtext.com/v1/conversations/e5c3b7b8-8f08-4d5a-9af1-0d11b0f4b7a0/messages" \
  -H "Authorization: Bearer $BLOOMTEXT_API_KEY" \
  -H "Idempotency-Key: $(uuidgen)" \
  -H "Content-Type: application/json" \
  -d '{"body":"Your appointment is confirmed for Tuesday at 10:00."}'

JavaScript

Request


const response = await fetch('https://api.bloomtext.com/v1/conversations/e5c3b7b8-8f08-4d5a-9af1-0d11b0f4b7a0/messages', {
  method: 'POST',
  headers: {
    Authorization: `Bearer ${process.env.BLOOMTEXT_API_KEY}`,
    'Idempotency-Key': crypto.randomUUID(),
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({"body":"Your appointment is confirmed for Tuesday at 10:00."}),
})
 
if (!response.ok) throw new Error(`BloomText API error: ${response.status}`)
const data = await response.json()

Python

Request


import os
import uuid
 
import requests
 
response = requests.post(
    "https://api.bloomtext.com/v1/conversations/e5c3b7b8-8f08-4d5a-9af1-0d11b0f4b7a0/messages",
    headers={
        "Authorization": f"Bearer {os.environ['BLOOMTEXT_API_KEY']}",
        "Idempotency-Key": str(uuid.uuid4()),
    },
    json={"body":"Your appointment is confirmed for Tuesday at 10:00."},
)
response.raise_for_status()
data = response.json()

Go

Request


package main
 
import (
	"bytes"
	"fmt"
	"io"
	"net/http"
	"os"
 
	"github.com/google/uuid"
)
 
func main() {
	body := bytes.NewBufferString(`{"body":"Your appointment is confirmed for Tuesday at 10:00."}`)
	req, err := http.NewRequest("POST", "https://api.bloomtext.com/v1/conversations/e5c3b7b8-8f08-4d5a-9af1-0d11b0f4b7a0/messages", body)
	if err != nil {
		panic(err)
	}
	req.Header.Set("Authorization", "Bearer "+os.Getenv("BLOOMTEXT_API_KEY"))
	req.Header.Set("Idempotency-Key", uuid.NewString())
	req.Header.Set("Content-Type", "application/json")
 
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
 
	out, _ := io.ReadAll(res.Body)
	fmt.Println(res.Status, string(out))
}

Ruby

Request


require "net/http"
require "json"
require "securerandom"
 
uri = URI("https://api.bloomtext.com/v1/conversations/e5c3b7b8-8f08-4d5a-9af1-0d11b0f4b7a0/messages")
request = Net::HTTP::Post.new(uri)
request["Authorization"] = "Bearer #{ENV.fetch("BLOOMTEXT_API_KEY")}"
request["Idempotency-Key"] = SecureRandom.uuid
request["Content-Type"] = "application/json"
request.body = { body: "Your appointment is confirmed for Tuesday at 10:00." }.to_json
 
response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(request)
end
data = JSON.parse(response.body)

Response · 201 Created


{
  "id": "4cbfdb50-6b7d-45d4-94b3-05a52ce3f4d1",
  "conversation_id": "e5c3b7b8-8f08-4d5a-9af1-0d11b0f4b7a0",
  "sender_id": "8b9c2d2f-6b1a-44f4-a7b1-0d6d3f2d6f55",
  "created_at": "2026-09-21T15:04:05Z",
  "type": "text",
  "body": "Your appointment is confirmed for Tuesday at 10:00.",
  "file": null,
  "reply_to_message_id": null
}