A computer vision card reader and/or point of sale device is described. The device is configured to sense when a user inserts a card into a card reader and to determine when a user departs or is about to depart from the device without retrieving the card. The device may issue an audible or visible alert to the user, reminding the user to retrieve the card. The device may additionally send a notification to a mobile device associated with the user that reminds the user that he has left a card at the point of sale. In some embodiments, message sent to the user contains a code and, upon entry of the code, the point of sale or card reader device returns the card to the user.

A point of sale application may initially process a transaction between a customer and a merchant. While the point of sale application processes the transaction, an add-on application may monitor a current state of a user interface of the point of sale application. Upon recognizing a triggering event associated with the current state of the user interface, the add-on application may take over the processing of the transaction from the point of sale application. Upon completion of the processing of the transaction, the add-on application may return a result of the transaction to the point of sale application by emulating user actions on the user interface of the point of sale application.

In a method, device information of a characteristic acquisition device associated with a target terminal is acquired in response to a triggering operation for establishing an association relationship between the characteristic acquisition device and a target client in the target terminal. The device information is transmitted to the blockchain network such that each of node devices in the blockchain network authenticates the characteristic acquisition device according to the device information. A respective reference authentication result generated by each of the node devices is acquired. The respective reference authentication result indicates whether the characteristic acquisition device passes authentication of the respective node device. The association relationship between the target client and the characteristic acquisition device is established in response to the characteristic acquisition device passing the authentication according to the reference authentication results.

A method and system for generating perceivable data representing a digital order is provided. A GUI receives a user selection of a particular button of a plurality of buttons. Each button of the plurality of buttons is for adding a respective menu or catalog item to a checkout cart. The particular button displays within its border at least one line of copy and at least one emoji, where the at least one emoji indicates the respective menu or catalog item. The at least one line of copy provides a text description of the respective menu or catalog item and is displayed in at least a minimum font point size and at least a minimum color contrast ratio relative to a background of the particular button. The GUI is then updated to indicate that the respective menu or catalog item for the particular button is added to the checkout cart.

An online service provisioning process is provided during which the service provider's knowledge about the user to whom the service is delivered does not increase. This is accomplished by presenting user attribute information to the service provider as obfuscated objects that can be independently verified and which are privacy preserving.

Example techniques relate to discovery and media control at a point-of-sale display.

The present disclosure generally relates to techniques for managing contextual transactions. In some examples, at a sender electronic device, a first user provides authorization to purchase an item for a second user. In some examples, at a recipient device, the second user selects one or more attributes for the item and requests to claim the item. In some examples, an electronic device displays a representation of an item and a purchase affordance for purchasing the item using a payment system that is available on the electronic device.

A system and method for verifying a non-scan item at a self-checkout point-of-sale terminal is provided. A merchandise item that isn't scanned at the self-checkout terminal is identified by a detection system. Further, a user helper device is provided to verify the incident by prompting the shopper for an input. The user helper device is operably connected to the self-checkout point-of-sale terminal and the detection system to determine and verify a fraudulent incident occurring during a transaction activity by the shoppers. Further, a store attendant device is provided for human intervention when necessary.

Methods and systems for detecting fraudulent activity at a self-checkout terminals of a retail store include a scanner for scanning an identifier of a candidate product located in the product-scanning area of the self-checkout terminal, and one or more sensors that detect at least one physical characteristic of the candidate product located in the product-scanning area of the self-checkout terminal. A computing device then correlates the obtained electronic data corresponding to actual identifying characteristic information associated with the candidate product to the reference physical characteristic information associated with the reference product in order to generate a similarity score between the actual and reference physical characteristic information. If the similarity score is above a predetermined similarity threshold, the self-checkout terminal is permitted to process a purchase of the candidate product, but if the similarity score is below the threshold, the self-checkout terminal is restricted from processing the purchase.

Techniques described herein are directed to, among other things, utilizing a self-centering user interface to receive information associated with a transaction. For instance, a computing device may receive a first input at a first location of a display. The computing device may then determine a positioning for the user interface, where the user interface may be substantially centered about the first location. In some instances, the computing device may display the user interface using the positioning. The computing device may then receive a second input corresponding to swipe from the first location of the display to a second location of the display. The computing device may then determine a symbol included in the user interface based at least in part on the second input. In some instances, the user interface includes a keypad for entering a personal identification number associated with a payment instrument.