emails/ui/setup/settings/03_urls.php

<?php
return [
    'urls' => function() {
        $arr = ['base' => $_SERVER['REQUEST_SCHEME'] . '://' . $_SERVER['HTTP_HOST']];
        $arr['api'] = $_ENV['API_URI'];
        return (object) $arr;
    },
    'view_urls' => function() {
        $arr = ['base' => $_SERVER['REQUEST_SCHEME'] . '://' . $_SERVER['HTTP_HOST']];
        $arr['api'] = implode('/', [$arr['base'], 'api']);
        return (object) $arr;
    },
];