@package Paypal Express Checkout Sample files

@license http://opensource.org/licenses/MIT

@URL http://www.sanwebe.com/2012/07/paypal-expresscheckout-with-php

• Checkout multiple products at once
• Custom paypal template (logo, color...)

• Checkout multiple products at once
• Process simplified
• Class improved
• Functions to compute total amounts, tax and charges
• Constants defined outside
• Tested live and it works