I was at a sporting event recently and they had people going around taking pictures and handing out slips/tickets that would enable the person in the picture to go on line and look up (and presumably purchase) their picture later. How is that done? How does the picture get linked / synced with a physical piece of paper or ticket system of sorts? I have a need to do something similar - a photo booth at an event. We want people to be able to have their picture taken and fill out a form. We need to somehow associate the picture with an external reference. Does this make sense? Any tips?