tabhandler.php

См. документацию.

<?php
 
namespace Bitrix\Sale\TradingPlatform;

abstract class TabHandler
{
    public $name = "";
    public $description = "";
 
    abstract public function action($arArgs);
    abstract public function check($arArgs);
    abstract public function showTabSection($divName, $arArgs, $bVarsFromForm);
}