One of the biggest problems with using PayPal, is that someone can simply view your page's source code and create their own modified version. They do this to pass a lower price to PayPal to get the same item that they would have had to pay more for.
You can prevent this by encrypting the data that is seen so that when someone wants to manually lower your prices, they will have to first decrypt your code before they can modify it. Thieves are lazy in general and will not go that extra mile to decrypt you data, when they can simply go to another web site and do it with ease.
Original Authors: Gobel Team (Nick)
Edit Update Authors: RPN
Updated On: 13/08/2007