Checkout by Amazon (for osCommerce v2.2MS2 and v2.2RC1)

[michael_s]

We have added the following enhancements to the add-on in this release:

* Checkout By Amazon Instant Order Payment Notification (IOPN) Integration.
* Inventory updates immediately after the order is placed.
* Separate page specifically for managing Checkout by Amazon orders.
* Ability to search Orders by Amazon Order Id in the "Amazon orders" on osCommerce admin UI.
* New Status codes for Checkout By Amazon orders to ensure that these do not clash with the custom status codes you might have already defined.
* Support for merchants to send Cart level Custom information that is stored with the order and passed on at different levels including callback and IOPN.

IMPORTANT NOTE
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Please note that order management for amazon orders on osCommerce admin UI works only if you have a HTTPS endpoint for IOPN.

THINGS TO REMEMBER
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1. Please set the IOPN endpoint in Seller central 2 hours prior to upgrading the 2.2 Plugin.
2. DO NOT use the upgrade script (upgrade_to_2.2.php) if you modified any of the original checkout by amazon add-on files and/or tables.

More...

[Gridd]

I am having trouble installing this. I have uploaded all the files but when it comes to manually edit shopping cart for instance, I cannot find the correct places to insert (Code). I believe it is because of the template system but cannot know for sure.
OsCMax 2.03 is what is currently loaded without any other mods.

Any help or direction would be appreciated.
Gridd