Localize script not working in ajax

Running the localize script after the script.min.js file

If that is the script you’re trying to localize, which you enqueued using the script handle mild-scripts, then you also need to use that as the script handle when calling wp_localize_script(). I.e.

wp_localize_script(
    'mild-scripts', // script handle
    'WPURLS',       // JS object name
    array(
        'ajax_url' => admin_url( 'admin-ajax.php' ),
        'site_url' => home_url(),
    )
);