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I need a discount code feature for my paypal buttons.
I need a small form box and a submit button that changes the price values of my paypal buttons by a specified amount - like 10$ - and gives an ajax "success" or "denied" to the user if they entered the right or wrong code.
For instance on my site: http://www.paggsupplement.com/order/ the 1 month supply is 60$, the ajax button should change the paypal button's value to $50 if they enter the right code.
The codes that trigger the amount should be