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  1. Firstly, an amazing book as usual! Your ability to break down code into English is invaluable and unparalleled! I am working on a site with sometimes limited inventory (perhaps as few as 4 of something). The client expects to sell in "bursts," ie, they send out an email, and people flood the site to purchase the items, effectively creating a race condition. Obviously, I can't have someone purchasing something that someone else has already purchased, so I have to remove it from the available stock as soon as possible. On the other hand, it is vital to the success of the system to minimize events where items are tied up in incomplete orders, ie, orders that have been placed but not cleared financially. I am not locked into paypal or any credit card authentication system for checkout yet, as choosing which to use largely depends on the resolution of this issue. At present, I feel that using a system like Authorize.net is my best bet, as I would have the chance to stop the sale right up until the moment that the user is submitting the financial data and thus making the sale final. My client would like to offer both paypal and on-site credit card payments, but is not insistent upon it. Any solutions or thoughts on this would be greatly appreciated.
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