“Buy X to get a discount”, “Spend not less than Y to get a gift”, “Buy product N to get K for free” and many other sales formulas can be successfully implemented using this extension. You can create as many rules as you wish and satisfy requirements even of the biggest ecommerce players.
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Never loose a customer after a sale, stay in contact with people who are most likely to be interested in another purchase. Use follow up emails to get opinion about the products a customer had purchased, request a feedback, offer related items, send attractive discounts and promotions, and anything else you could imagine.