Как создать группу и отправить в неё сообщение#

composer require green-api/whatsapp-api-client-php

require './vendor/autoload.php';

$greenApi = new GreenApiClient( ID_INSTANCE, API_TOKEN_INSTANCE );

<?php
require './vendor/autoload.php';

define( "ID_INSTANCE", getenv("ID_INSTANCE" ));
define( "API_TOKEN_INSTANCE", getenv("API_TOKEN_INSTANCE") );

$chatIds = [
    '11001234567@c.us'
];
$resultCreate = $greenApi->groups->createGroup('GroupName', $chatIds );

if ($resultCreate->code == 200)
    $resultSend = $greenApi->sending->sendMessage($resultCreate->data->chatId, 
        'Message text');

php -S localhost:8080