Magento Multiple Coupons Extension

It's very inconvenient for your customers and even a bit absurd to place several orders to be able to use all coupons. Some customers will get discouraged to place additional orders, which converts into lost revenue for you. Imagine, your customer has 2 coupons: 10% Magento discount code on every piece and 10$ flat discount. If she wants to make a significant purchase, she will be happy to use both coupons at once, while you’ll get a loyal customer as a result. view site- http://www.ecomextension.com/multiple-coupons.html