Hello William,
Thank you for your question about the white label. Been meaning to reply, but right now we're moving to a new software framework, so we are not going to be able to take any new clients until after the new year. I answered your questions below.
The white label is essentially the complete interior website, but with your style sheet and logo, plus the help pages.
Each customer authenticates their own ID individually. Your eBay ID isn't used. Your human identity remains anonymous (except, of course, for public info you have on file with your state comptroller).
Thank you for taking the time to write in and please let us know if you have any other questions in the interim.
bidslammer