Zend_Payment_Gateway_Tranzila - http://www.vadimg.co.il/2009/04/28/zend_payment-using-tranzila-as-the-gateway/Zend_Payment_Gateway_MoneyBookers - http://www.vadimg.co.il/2009/04/28/zend_payment-using-moneybookers-as-the-gateway/Zend_Payment_Gateway_Paypal - http://www.vadimg.co.il/2009/04/28/zend_payment-using-paypal-as-the-gateway/
(FYI: Looks like the code in your blog has lost its indentation)
