Looking to sell custom videos

I am looking to sell custom videos I had made by girl on MFC. I will be telling them it is for my site (clips4sale right now.) and I would like to know how to go about asking for identification. I don't think the average person would be willing to send their ID to a stranger so how would I get it? I'm thinking I can buy a non-nude "tester" video to see if I like their work, then buy a real video at a higher "signing bonus" rate and request the ID with that video. The problem is 1. they may not want to do videos at a lower rate after the "signing bonus" one, and 2, if i tell them I would be paying higher for an ID but they dont want to give it, they might just think "fuck this guy for wanting my ID im gonna rip him off"