title: Coupon Code For Paypal Express Checkout
body: <p>I'm using Paypal Express Checkout system on my website. But I want to put a coupon (discount) code area. It will make a reduction if code is true. (Like GoDaddy.com's cart system)</p>
  
  <p>Have you any idea, where should I start for this?</p>
  
  <p>(I'm not using any eCommerce framework)</p>