You have 3 questions posted for the same thing, so I'll answer all 3 of them here. I have heard of this feature but it usually comes with those POS things that plug in to smart phones, I think they email receipts, though there was one that could print out a paper receipt there on the spot with a small portable printer of some kind. They usually come with the merchant accounts. You can check with several vendors of those and see who offers them. Or do a google search for the printers and see if they come with software.