curl --request POST \
  --url https://api.assembly.com/v1/message-channels \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --data '
{
  "membershipType": "individual",
  "clientId": "client_abc123",
  "companyId": "company_abc123",
  "memberIds": [
    "user_abc123",
    "user_def456"
  ],
  "membershipEntityId": "client_abc123"
}
'

import requests

url = "https://api.assembly.com/v1/message-channels"

payload = {
    "membershipType": "individual",
    "clientId": "client_abc123",
    "companyId": "company_abc123",
    "memberIds": ["user_abc123", "user_def456"],
    "membershipEntityId": "client_abc123"
}
headers = {
    "X-API-KEY": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-KEY': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    membershipType: 'individual',
    clientId: 'client_abc123',
    companyId: 'company_abc123',
    memberIds: ['user_abc123', 'user_def456'],
    membershipEntityId: 'client_abc123'
  })
};

fetch('https://api.assembly.com/v1/message-channels', 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://api.assembly.com/v1/message-channels",
  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([
    'membershipType' => 'individual',
    'clientId' => 'client_abc123',
    'companyId' => 'company_abc123',
    'memberIds' => [
        'user_abc123',
        'user_def456'
    ],
    'membershipEntityId' => 'client_abc123'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-KEY: <api-key>"
  ],
]);

$response = curl_exec($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://api.assembly.com/v1/message-channels"

	payload := strings.NewReader("{\n  \"membershipType\": \"individual\",\n  \"clientId\": \"client_abc123\",\n  \"companyId\": \"company_abc123\",\n  \"memberIds\": [\n    \"user_abc123\",\n    \"user_def456\"\n  ],\n  \"membershipEntityId\": \"client_abc123\"\n}")

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

	req.Header.Add("X-API-KEY", "<api-key>")
	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://api.assembly.com/v1/message-channels")
  .header("X-API-KEY", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"membershipType\": \"individual\",\n  \"clientId\": \"client_abc123\",\n  \"companyId\": \"company_abc123\",\n  \"memberIds\": [\n    \"user_abc123\",\n    \"user_def456\"\n  ],\n  \"membershipEntityId\": \"client_abc123\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.assembly.com/v1/message-channels")

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

request = Net::HTTP::Post.new(url)
request["X-API-KEY"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"membershipType\": \"individual\",\n  \"clientId\": \"client_abc123\",\n  \"companyId\": \"company_abc123\",\n  \"memberIds\": [\n    \"user_abc123\",\n    \"user_def456\"\n  ],\n  \"membershipEntityId\": \"client_abc123\"\n}"

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

{
  "clientId": "client_abc123",
  "companyId": "company_abc123",
  "createdAt": "2023-01-01T00:00:00Z",
  "id": "abc123",
  "lastMessageDate": "2023-01-03T00:00:00Z",
  "lastRead": "2023-01-02T12:00:00Z",
  "memberIds": [
    "user_abc123",
    "user_def456"
  ],
  "membershipEntityId": "client_abc123",
  "membershipType": "individual",
  "object": "messageChannel",
  "unreadCount": 3,
  "updatedAt": "2023-01-02T00:00:00Z"
}

{
  "code": "<string>",
  "data": "<unknown>",
  "message": "<string>"
}

{
  "code": "<string>",
  "data": "<unknown>",
  "message": "<string>"
}

{
  "code": "<string>",
  "data": "<unknown>",
  "message": "<string>"
}

{
  "code": "<string>",
  "data": "<unknown>",
  "message": "<string>"
}