A multi-level machine-readable code system and method deployed in an environment supported by a wireless access control system network. The multi-level machine-readable code system including multi-level codes including facility-level codes, site-level codes and device-level codes, that are scanned by mobile computing devices such as mobile smart phones to initiated web-based e-commerce-enabled transactions that allow guest users to select and rent the particular networked devices available for rental and use within a facility, such as, for example, storage lockers, strollers, EVCs, wheelchairs and the like at a site selected within the environment. The wireless access and control system network can automatically assign an available device to the guest user at the selected site. When the guest reads the device-level machine-readable code on a device available for rental at a site, the wireless control access network also enables the guest users to scan the code and rent the device at the selected site and automatically control access to the rented device at the selected site, for access and use in the environment.