PayPal Express Checkout IPN

[michael_s]

- v0.3.1 :

* Bug Fixed - The shipping address query from databse didn't work well and cuased in some cases an endless loop between checkout shipping and express checkout. Rewrote the shipping address checking and the endless loop problem fixed.
* Minor Improvement - Added extra checking in checkout shipping to decide to enable EC IPN or not. Now you can add condition checkings in function update_status().
* Added to Known Issues section regarding the extra condition checkings.
* PayPal live server behavior changed and when the payment exceeds the maximum amount allowed, PayPal will reject the payment and send the payer back to store. There for it has been removed from the known issues section in this guide.
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Full package - instruction for upgrade from v3.0 included in install guide.

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

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