Sender::unbind

static function unbind($moduleId, $eventName)
{
	$eventManager = EventManager::getInstance();
	$eventManager->unRegisterEventHandler($moduleId, $eventName, "rest", "\Bitrix\Rest\Event\Callback", static::getHandlerName($moduleId, $eventName));

	/* compatibility */
	$eventManager->unRegisterEventHandler($moduleId, $eventName, "rest", "CRestEventCallback", static::getHandlerName($moduleId, $eventName));
}