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4. Payment Buttons > 36. Hack-Proof Your Payment

Hack-Proof Your Payment

Prevent code-tampering and price-spoofing with a hidden form post.

When deploying PayPal buttons on your web site, you should consider the risk of spoofed payments. PayPal buttons are normally created in plain HTML, with the variables and their values available for anyone to see (select ViewSource in your browser to see for yourself). This means that anyone can view your button source code, copy the HTML to her own system, make changes to the variables (such as the price), and make a payment with the modified button. You can manually review purchases to make sure no tampering has taken place, but in high-volume or automated systems, this might be a difficult or even impossible task.


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