How to setup a coupon code to work at the check out in POSitiveCommerce
1) Login to your website's Control Panel
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http://www.yoursite.com/administrator
2) Click on Virtuemart Manager
3) In the top row of menus for Virtuemart, choose Coupon > Coupon List
4) Choose New from the icons on the top right
5) Enter the values you wish and choose Save from the icons on the top right