Sender.php

<?php
 
namespace Bitrix\MessageService\Controller;
 
use Bitrix\Main\Error;
use Bitrix\Main\Localization\Loc;
 
class Sender extends \Bitrix\Main\Engine\Controller
{
    public function getTemplatesAction(string $id, array $context = null): ?array
    {
        $sender = \Bitrix\MessageService\Sender\SmsManager::getSenderById($id);
        if (!$sender)
        {
            $this->errorCollection->setError(new Error(Loc::getMessage('SENDER_TEMPLATES_WRONG_SENDER')));
 
            return null;
        }
 
        if (!$sender->canUse() || !$sender->isConfigurable() || !$sender->isTemplatesBased())
        {
            $this->errorCollection->setError(new Error(Loc::getMessage('SENDER_TEMPLATES_CAN_NOT_USE')));
 
            return null;
        }
 
        return [
            'templates' => $sender->getTemplatesList($context)
        ];
    }
}