There are 6 links tagged.
https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/library_code
Added: 23/08/09 Tags: paypal IPN samplecode
http://integrationwizard.x.com/index.php
Added: 25/03/08 Tags: paypal
http://www.web-development-blog.com/archives/easy-payments-using-paypal-ipn/
http://www.micahcarrick.com/04-19-2005/php-paypal-ipn-integration-class.html