Send a message

curl --request POST \
  --url https://osis.co/api/v1/comms/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "to": "<string>",
  "conversation_id": "<string>",
  "body": "<string>",
  "channel": "<string>",
  "idempotency_key": "<string>"
}
'

import requests

url = "https://osis.co/api/v1/comms/messages"

payload = {
    "to": "<string>",
    "conversation_id": "<string>",
    "body": "<string>",
    "channel": "<string>",
    "idempotency_key": "<string>"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    to: '<string>',
    conversation_id: '<string>',
    body: JSON.stringify('<string>'),
    channel: '<string>',
    idempotency_key: '<string>'
  })
};

fetch('https://osis.co/api/v1/comms/messages', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://osis.co/api/v1/comms/messages",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'to' => '<string>',
    'conversation_id' => '<string>',
    'body' => '<string>',
    'channel' => '<string>',
    'idempotency_key' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://osis.co/api/v1/comms/messages"

	payload := strings.NewReader("{\n  \"to\": \"<string>\",\n  \"conversation_id\": \"<string>\",\n  \"body\": \"<string>\",\n  \"channel\": \"<string>\",\n  \"idempotency_key\": \"<string>\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://osis.co/api/v1/comms/messages")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"to\": \"<string>\",\n  \"conversation_id\": \"<string>\",\n  \"body\": \"<string>\",\n  \"channel\": \"<string>\",\n  \"idempotency_key\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://osis.co/api/v1/comms/messages")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"to\": \"<string>\",\n  \"conversation_id\": \"<string>\",\n  \"body\": \"<string>\",\n  \"channel\": \"<string>\",\n  \"idempotency_key\": \"<string>\"\n}"

response = http.request(request)
puts response.read_body

POST

api

comms

messages

Send a message

curl --request POST \
  --url https://osis.co/api/v1/comms/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "to": "<string>",
  "conversation_id": "<string>",
  "body": "<string>",
  "channel": "<string>",
  "idempotency_key": "<string>"
}
'

import requests

url = "https://osis.co/api/v1/comms/messages"

payload = {
    "to": "<string>",
    "conversation_id": "<string>",
    "body": "<string>",
    "channel": "<string>",
    "idempotency_key": "<string>"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    to: '<string>',
    conversation_id: '<string>',
    body: JSON.stringify('<string>'),
    channel: '<string>',
    idempotency_key: '<string>'
  })
};

fetch('https://osis.co/api/v1/comms/messages', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://osis.co/api/v1/comms/messages",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'to' => '<string>',
    'conversation_id' => '<string>',
    'body' => '<string>',
    'channel' => '<string>',
    'idempotency_key' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://osis.co/api/v1/comms/messages"

	payload := strings.NewReader("{\n  \"to\": \"<string>\",\n  \"conversation_id\": \"<string>\",\n  \"body\": \"<string>\",\n  \"channel\": \"<string>\",\n  \"idempotency_key\": \"<string>\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://osis.co/api/v1/comms/messages")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"to\": \"<string>\",\n  \"conversation_id\": \"<string>\",\n  \"body\": \"<string>\",\n  \"channel\": \"<string>\",\n  \"idempotency_key\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://osis.co/api/v1/comms/messages")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"to\": \"<string>\",\n  \"conversation_id\": \"<string>\",\n  \"body\": \"<string>\",\n  \"channel\": \"<string>\",\n  \"idempotency_key\": \"<string>\"\n}"

response = http.request(request)
puts response.read_body

Place an outbound message on your Comms line. Scope: comms_send

Request

curl -X POST "https://osis.co/api/v1/comms/messages" \
  -H "Authorization: Bearer $COMMS_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: order-4242-confirm" \
  -d '{
    "to": "+12125550147",
    "body": "Your appointment is confirmed for Tuesday at 3pm."
  }'

Headers

Header	Required	Description
`Authorization`	Yes	`Bearer <COMMS_API_KEY>`
`Content-Type`	Yes	`application/json`
`Idempotency-Key`	Recommended	Stable key for safe retries

Body parameters

string

E.164 destination phone number. Required unless conversation_id is set.

string

Existing conversation to continue. Required unless to is set.

string

required

Message text delivered to the recipient.

string

Optional: auto (default), sms, or imessage. auto lets the host pick a rail. If iMessage is rejected before anything leaves the phone (Android / not registered), Comms retries once as SMS on the same line. Timeouts and unknown sends do not fall back.

string

Same as the Idempotency-Key header. Either form is accepted.

Response

202 Accepted

First time this idempotency key is seen.

{
  "message": {
    "id": "msg_01HZX…",
    "body": "Your appointment is confirmed for Tuesday at 3pm.",
    "direction": "outbound"
  }
}

200 OK (duplicate)

Same idempotency key already processed — no second send.

{
  "message": {
    "id": "msg_01HZX…",
    "body": "Your appointment is confirmed for Tuesday at 3pm.",
    "direction": "outbound"
  },
  "duplicate": true
}

Errors

Status	Example body	Cause
401	`{ "error": "unauthorized" }`	Bad or missing key
403	`{ "error": "missing comms_send scope" }`	Key lacks send
429	`{ "error": "rate_limited", "retry_after": 60 }`	Send or global limit

Code samples

await fetch("https://osis.co/api/v1/comms/messages", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.COMMS_API_KEY!}`,
    "Content-Type": "application/json",
    "Idempotency-Key": `order-${orderId}-confirm`,
  },
  body: JSON.stringify({
    to: customerPhone,
    body: "Your appointment is confirmed for Tuesday at 3pm.",
  }),
});

requests.post(
    "https://osis.co/api/v1/comms/messages",
    headers={
        "Authorization": f"Bearer {os.environ['COMMS_API_KEY']}",
        "Content-Type": "application/json",
        "Idempotency-Key": f"order-{order_id}-confirm",
    },
    json={
        "to": customer_phone,
        "body": "Your appointment is confirmed for Tuesday at 3pm.",
    },
)

Core

Messages

Conversations

Lines

Webhooks

AI

Events

Send a message

Request

Headers

Body parameters

Response

202 Accepted

200 OK (duplicate)

Errors

Code samples

See also

​Request

​Headers

​Body parameters

​Response

​202 Accepted

​200 OK (duplicate)

​Errors

​Code samples

​See also

Request

Headers

Body parameters

Response

202 Accepted

200 OK (duplicate)

Errors

Code samples

See also