Coupon support for Piggybak. Includes types %, $, and freeshipping. Coupons have a specified amount (tied to % and $ use), a minimum cart total, expiration date, and number of uses.
CanCan access must be updated to allow admin access to view coupons.
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Document installation notes
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Modify JS to not require addition of "inputs", complete via backend filter instead.
Copyright (c) 2011 End Point & Steph Skardal. See LICENSE for further details.