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7. IPN and PDT > 73. Implement Price Checking with IPN

Implement Price Checking with IPN

Prevent fraudulent transactions by comparing the value of the goods purchased with the amount received.

PayPal has taken many steps to ensure that their system is secured against fraudulent transactions. However, just like any online eCommerce system, there are always ways for an unscrupulous person to attempt to cheat you. The PayPal Buy Now and Shopping Cart buttons, for example, are normally displayed as plain text in your web page’s source code, which means that anyone can view your HTML code or—more importantly—copy and modify the code, and then submit a spoof payment (presumably with a lower price) to PayPal. And since PayPal doesn’t maintain an active database of all the current prices of your products, it’s up to you to engage in some proactive price checking.


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