Instant Payment Notification

Instant Payment Notification (IPN) is a way to allow online retailers to handle real-time purchase confirmation and server-to-server communication. This allows the retailer to store transaction or order information in its own database to track its own sales data internally.

List of Instant Payment Notification providers

• PayPal, http://www.paypal.com/cgi-bin/webscr?cmd=p/xcl/rec/ipn-intro-outside
• Paymate, http://www.paymate.com.au/sitehelp/cart.html (see "Output Parameters")
• iKobo, http://www.ikobo.com/ipn_manual.pdf
• Stormpay, http://www.stormpay.com/stormpay/user/user_help.php?cat=12&faq=62&s=1
• 2Checkout, http://www2.2checkout.com/sgml/SignUpGuide/x891.html (see "Passed Back Parameters")
• eWAY, http://www.eway.com.au/support/shared_structure.asp
• Clickbank, http://cgi-central.net/opened/html/x288.htm
• VeriSign PayFlow, http://cgi-central.net/opened/html/x288.htm