如何获取Magento中当前会话订单的优惠券代码折扣金额

I'm trying to find a code that will give me the discount amount for the current session order when I discount code is used.

Here is what I have right now but it is not working:

        $coupon = Mage::getModel('salesrule/rule');
        $couponCollection = $coupon->getCollection();
        foreach($couponCollection as $c){
            $CouponDiscount = $c->getDiscountAmount();
        }
        echo $CouponDiscount;

How can I get the amount of the discount used in the current session order ?

To get the current discount amount for your customers quote please see here:

https://magento.stackexchange.com/a/33761