At some point, I want to set up a shop. I've already written a script that can make customized models using image files as input. What I'm wondering is how can I allow the person that would be letting me use their image to see the model and buy the model while hiding the customized model from other users. I want to be able to make customized models that can only be sold and shown to the person that I'm working with. Any advice would be greatly appreciated.