This plugin is the PERFECT plugin for my site. Instead of using coupon codes, I am considering using this to supply promotional MMORPG game serial codes given to me by the game distributors.
I do have some suggestions because, while it works perfectly, it feels a bit "bloated."
Is there any way that instead of producing a PDF file, that the coupon/serial/voucher can be viewed directly on the page that they clicked?
Also, is there a way to set a custom "Sorry, but this promotion has expired" type message? As it stands now, once you click a promotion link, you are brought to a blank, non-wordpress html page that shows "Sorry, that item has run out." While it's a good start, it would be great if it used a WordPress template/theme page so it shows the user that they still are on the same site.
All in all, this is a great plugin. I would definitely use this if you could choose between on-screen/page and PDF delivery.