You can find a lot of PayPal IPN Handlers in network, but there are no Moneybookers IPN examples in internet. Here you can download simple Moneybookers IPN handler and use it as you wish.
Archive contains two PHP-files:

• moneybookers_button.php: PHP/HTML-code to generate Moneybookers "Buy now" button;
• moneybookers_ipn.php: PHP-file that handle IPN requests from Moneybookers (handler sends notification to payer and to website administrator).

Exploring of these files is a good way to learn how Moneybookers instant payment notification works. You are free to use ones for any of your projects. Thank you.