Abstract: Provided is a mobile application and system which can provide rewards to a user based on purchases of various brands, companies, and the like, in a non-intrusive manner. In one example, the method may include storing user verification credentials in a database, receiving an input value via a mobile application installed on a user device and transmitted to a host platform that hosts the mobile application, calling a verification service based on the stored user verification credentials, via an application programming interface (API), which verifies a payment account of the user can cover the input value, and in response to receiving verification from the verification service, fetching a pre-loaded token from a token service based on the input value and transmitting the pre-loaded token to the mobile application installed on the user device.

Abstract: An interface device fits between a point-of-sale terminal and a peripheral element, for example, the UPC scanner, to permit a rapid checkout of groceries or the like by simulating rapid scanning of a stored grocery list accumulated by a consumer in a roaming checkout through the store. The consumer scans items as he or she shops to create the stored grocery list. A promotional system for providing coupons at the point of purchase decision and the novel method of handling items that need to be weighed are also provided.