Abstract: A method for a security system includes receiving a first location and a first time period, retrieving an access control tree having nodes associated with locations and edges coupling nodes, wherein a first node represents the first location and a second node represents a building entry, traversing the access control tree from the second node to the first node to determine an ordered list of nodes and associated time periods, storing the ordered list of nodes and an identifier associated with a user, providing to a smart device a token associated with a requested access control point, when a requested node is within the first ordered list of nodes, and authorizing with the requested access control point a physical action visible to the user in response to the requested token.

Abstract: A method and system for purchasing items from a payment device is provided. The method and system includes utilizing near field communications technology to purchase items on a per-item basis. The method and system further includes utilizing barcode technology to purchase items on a per-item basis. The method and system additionally includes utilizing beacon technology to purchase items on a per-item basis. More specifically, the method includes approaching an item desired to be purchased and opening a payment application on the payment device; transmitting purchasing data to the payment device, the purchasing data comprising item details and payment information corresponding to the item desired to be purchased; processing through the payment application the purchasing data, the processing including contacting a payment gateway to authorize a financial transaction for purchasing the item; and indicating on the payment application a successful or failed financial transaction.