Bitrix. How to get $request->getPost("id")?

Question

1C-Bitrix

This code works (as I understand it) when ordering goods in init.php

use Bitrix\Sale,
   Bitrix\Main\Application;

$request = Application::getInstance()->getContext()->getRequest();

$basket = Sale\Basket::loadItemsForFUser(Sale\Fuser::getId(), Bitrix\Main\Context::getCurrent()->getSite());
<b>$productId = intval( $request->getPost("id") )</b>;

$request->getPost("id") - how to get this?

Answer 1

This code works by itself, conditions like adding to cart are not defined here
receives a request object
under normal conditions is similar$_POST['id']
and this piece of code is not shown in any way
make a POST request to this page with the id parameter