How to write a phone number in a profile during auto-registration (BITRIX)?

Question

1C-Bitrix

Good afternoon
The site has a minimally customized ordering component, the user fills in 5 fields, one of them is a phone number, but this number is not saved in the user profile.
I tried to write a handler, but it didn’t work for me, I almost didn’t encounter them, and with php I’m so-so
Here’s what I tried to use:

AddEventHandler("sale", "OnBeforeOrderAdd", "OnBeforeOrderAdd");
 function OnBeforeOrderAdd(&$arProps)
   {
    //  echo "<pre>";
    //  print_r($arProps);
    //  echo "</pre>";
    //  die();
    global $USER;
    $userID = $USER->GetID();
       $user = new CUser;
        $fields = Array(
        "PERSONAL_PHONE" => $arProps['ORDER_PROP']['3'],
        );
        $user->Update($userID, $fields);
   }

I assume that at the moment the handler is triggered, the user is not yet authorized and it is not possible to pull out $userID = $USER->GetID();
The $arProps['ORDER_PROP']['3']phone number entered into the form by the user is stored in

Answer 1

Look here https://dev.1c-bitrix.ru/community/webdev/user/168...

Answer 2

Assume right) You need to either register and authorize the user before recording the order, and give the order a user ID, or search the filter for a user with this phone in already registered ones and authorize him