chat.php

См. документацию.

<?php
 
namespace Bitrix\Socialnetwork\Controller;
 
use Bitrix\Im;
use Bitrix\Main\Loader;
 
class Chat extends Base
{
    public function createAction(array $userIds): int
    {
        if (!Loader::includeModule('im'))
        {
            return 0;
        }
 
        $result = Im\V2\Chat\ChatFactory::getInstance()->addChat([
            'TYPE' => Im\V2\Chat::IM_TYPE_CHAT,
            'SKIP_ADD_MESSAGE' => 'Y',
            'AUTHOR_ID' => $this->userId,
            'USERS' => $userIds,
        ]);
 
        return $result->getData()['RESULT']['CHAT_ID'];
    }
}