coupon generator

[ken1]

Using a Facebook app, I want the user to sign up to my email list. After he does he can click a download button that can send him to a url.
Does ZC have a plug in that will create a unique coupon number for him so that both the user and ZC know the number.
I want to give a one time discount when they give me their email address and use the coupon number they received.

thanks

[dbltoe]

Perhaps http://www.zen-cart.com/downloads.php?do=file&id=1718