When I put a dollar into a pop/snack machine what does it check for on the dollar to make sure its a “legit” dollar bill? Links would be great! Thanks, Muah.

I bought 17 Vend star 3000 candy vending machines for a great deal. Now I need to know how to get them into the local business. Is it best to go in person or call. What is a good sales line to get them excited about having my machines in there business?