I am trying to create a coupon that is available upon liking one of my clients pages. Once the like button is clicked I'd like a coupon to be available, only once to that person. I'm assuming I'd need to set up a Facebook app that looks at who's logged in and then decides weather to display the coupon, a like us screen for the coupon or an already redeemed page. Ive looked for examples and haven't found any, anyone know of code out there or can tell me how to execute it