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My client wants to be able to have her customers enter coupon codes to buy her jewelry at a discount. I cannot find ANY way to do that through PayPal. Of course we need the easiest, most cost effective solution.

How would I use your product and integrate it to the add to cart buttons I already have? I host the site myself, and don't want to have to completely redo all of these buttons or worse, the entire site.

E-junkie can handle the discount codes like you want, but there is no way to do it without using E-junkie cart buttons. Sorry :(