Facebook photo upload photo and vote

Client will have a media/social media campaign encouraging people to upload a photo of their most embarrassing fashion/beauty photo to the client FB page. People will then vote on their favorite pictures and at the end of voting, the top 5 will be judged by a panel of client judges and the top winner will get a trip. This will go on for a month. This is how they would like to user experience to go: Go to client FB page Upload Photo Provide Caption (30 words or less) Provide Email address Provide address or zip code (only if needed for geolocating) Accept rules and regs Post Photo There should be a button to Share photo on consumers own FB page Consumer receives an html email confirming their entry with a coupon redeemable at a client store near them. We would like the email to determine the closest store based on the zip code (we want to avoid having to enter full address as it takes too long). The email should also have a unique bar code that the stores can scan to ensure they are not used more than once. Can you supply a list of the barcodes that will be generated so that each client store can put them into their systems? Is it possible to force everyone to like Client FB before posting a photo and voting? Assuming this is done on FB from a home computer (not mobile device) will there be extra steps for the consumer or will they just hit the Like button?