Advanced Wordpress Facebook Like Plugin

Hello, I am searching for someone, who is able to develop the follwing wordpress plugin: -Facebook "LIKE" button shown on a site by shortcode -after a user clicks on "LIKE" the user should be redirected to a different specified page -On the page after the Like-Page shoud be a Coupon-Code displayed. BUT! only one coupon code for each Facebook user - that is my issue - redirecting and display a coupon code is no prob, but to avoid that a user 1. klicks like, gets redirected and see the coupon code and maybe a week later he comes again klicks "Unlike" first - than again klicks "LIKE" and receives the next coupon-code is the thing we need. -Landing Page after "LIKE" in Wordpress should do the following steps: 1. Check if users come from the LIKE page by klicking the LIKE Button - if not - message to be specified from plugin administration 2. Check if Facebook user allready received a coupon code via that landing page before (My-SQL?)- if yes - message to be specified from plugin administration 3. If not - display the coupon code - The coupon code is not the issue, just the "if - when" thing 4. User will NOT be logged in into Wordpress To be specified via plugin administration: -Facebook app id / if needed - secret -Fanpage for wich the LIKE shoud be Like Button on LIKEPAGE and Ceck on Landingpage should be implimented via [Shortcodes] if possible Please feel free to ask if you still got questions