I would like to suggest some improvement in “Coupon Code” Plugin. I would like to visualize Who, When, How and How Much coupons are used. Something like that:

User / coupon code / plan / Discount / date
User A / 123456 / Silver / 10% / 05-02-2013
User B / 456125 / Gold / 20% / 10-05-2013

Thanks,