Again, sorry for the length, I hope it all makes sense. I had a few after thoughts after making the video. I’m not sure you really need the POS extension, I think you could create orders for what your doing using what is built in. Even if you want to use Authorize.net’s customer database, you can just mark the order as paid in prestashop. This really is a slick system.
Let me know what questions you have. Shoot me an email, give me a call, or use the comments box below.