Where is the checkout processor located?

Question

1C-Bitrix

Means.
After placing an order on a site managed by Bitrix, it falls into Bitrix24 transactions.
But I can’t solve the issue: I added
sale.order.ajax
in the component template hidden inputs inside the form tag, they are not listed in the field lists, in the store settings. If I add them to the list of fields, before they become available in the checkout form, and then they are visible in my account after placing the order. I created the necessary hidden fields in Bitrix24, for example (NAME_00000)

<form id="ORDER">
<input type="hidden" name="NAME_00000"  value= >

а дальше идут основные поля personal ...

How to make sure that this hidden field gets the name in Bitrix24 in the required additional field.
I can’t figure out where to write in the handler and where the handler itself is, what you need to take these fields and send to Bitrix24.
If something is not clear what I wrote, I will explain. thanks for the help

Answer 1

component.php or class.php in sale.order.ajax