PayPal Express Checkout IPN

[michael_s]

- v0.3
This version is fully functioning and pretty stable.
-------------------------------------------------
* Changed installation requirement. Modifications to checkout_shipping.php is now required.
* Bug Fixed - When checkout via button with an invalid shipping address, customers were sent back to checkout shipping page without any error message. Now an Address Error message added to inform customers to provide a valid address.
* Bug Fixed - If the HTTPS_SERVER and DIR_WS_HTTPS_CATALOG was not defined in catalog/includes/configure.php, PayPal would throw back an error saying CancelURL is invalid. Now utilized tep_href_link() function in the core file to define CancelURL.
* Re-organized the core file to handle shipping address changed at PayPal page in a better way.
* Modified setting options in admin page to reflect the live server's behavior.
* Modified setting options descriptions in install guide to reflect the live server's behavior.
-------------------------------------------------
Full package.

Support Thread :http://forums.oscommerce.com/index.php?showtopic=245571

More...