Register Plus Redux and QuForm

Hello,

I’m using both QuForm and Register Plus Redux on my site.
I have created a new registerform with Register Plus Redux , with things like “zipcode” and “city.”

QuForm has the ability to send a mail with variables like “username” , “email address” and etc.
I would like to add my own variable in QuForm , zipcode and city (made with register plus redux).

I probably have to do something like this in functions.php:

function my_newRPR_variables($mailer, $form, $attachments)
{
    $city = get_user_city_from_register_plus_redux();
    $mailer->Body = str_replace('{city}', $city, $mailer->Body);

    $zipcode = get_zipcode_from_register_plus_redux();
    $mailer->Body = str_replace('{zipcode}', $zipcode, $mailer->Body);

    // return the $mailer object
    return $mailer;
}
add_action('iphorm_pre_send_notification_email', 'my_newRPR_variables', 10, 3);
add_action('iphorm_pre_send_autoreply_email', 'my_newRPR_variables', 10, 3);

I’m having troubles with $city and $zipcode , does anyone have an idea how to do this ?

https://wordpress.org/plugins/register-plus-redux/