withinweb

PHP-KeyCodes is now able to use Google checkout as well as PayPal. 

In some ways Google checkout provides a better user experience than PayPal as the key code can be displayed to the customer on their Google checkout page. 

PHP-Keycodes can be used with a response handler (the code that monitors the transaction returned from Google checkout) but this requires SSL (a site that has https) or it can be used without the response handler and so your web site does not require SSL to handle the return data from Google.  Without a response handler you do not get the updates of Google sales back at your web site, but otherwise it operates in the same way.