Битрикс api смена логина и пароля
<?php
$id = 1;
$newLogin = '';
$newPassword = '';
require($_SERVER['DOCUMENT_ROOT'].'/bitrix/modules/main/include/prolog_before.php');
global $USER;
$USER->Update($id, [
'EMAIL' => $newLogin,
'LOGIN' => $newLogin,
'PASSWORD' => $newPassword,
'CONFIRM_PASSWORD' => $newPassword
]);
echo $USER->LAST_ERROR;
?>1