Why does it have to be web-based? There are public rental systems that can be unlocked with a phone call (or maybe even SMS). Not every solution to a problem ne

Why does it have to be web-based? There are public rental systems that can be unlocked with a phone call (or maybe even SMS). Not every solution to a problem needs to involve a computer on both ends. Of course it's nice to have the web or app solution in addition to that, but it really shouldn't be the only way of interacting with such a system.