BUY SEVERAL PRODUCTS AND GET A %:
10 ARTICLES BOUGHT = 10%
PUT happy10 in the coupon area
15 ARTICLES BOUGHT = 15%
PUT happy15 in the coupon area
20 ARTICLES BOUGHT = 20%
PUT happy20 in the coupon area
30 ARTICLES BOUGHT & OVER = 30%
PUT happy30 in the coupon area