Abstract: A point of sale system includes a merchant terminal and a customer terminal. The merchant terminal is configured to display a user interface (UI) window on the merchant terminal. The UI window on the merchant terminal displays a merchant-specific version of a screen displayed on the customer terminal. The merchant terminal receives updates from the customer terminal regarding the status of the payment portion for a transaction. The merchant terminal can provide an input to the UI window which is sent as a message to the customer terminal. Control of state for the point of sale system is shared such that when the system is in a first state, the merchant terminal is the state control terminal, and when the point of sale system is in a second state, the customer terminal is the state control terminal and has control of state for the system.

Abstract: A point of sale system includes a merchant terminal and a customer terminal. The merchant terminal is configured to display a user interface (UI) window on the merchant terminal. The UI window on the merchant terminal displays a merchant-specific version of a screen displayed on the customer terminal. The merchant terminal receives updates from the customer terminal regarding the status of the payment portion for a transaction. The merchant terminal can provide an input to the UI window which is sent as a message to the customer terminal. Control of state for the point of sale system is shared such that when the system is in a first state, the merchant terminal is the state control terminal, and when the point of sale system is in a second state, the customer terminal is the state control terminal and has control of state for the system.

Abstract: A payment terminal may run a point-of-sale application that is operated by a user such as a merchant. At a certain point in the transaction, but prior to the completion of the transaction, pre-charge requests may be sent to a chip card. The responses from the chip card may be stored such that the transaction may be completed immediately after the merchant and customer complete the transaction steps.

Abstract: A payment terminal includes multiple chips that perform different processing functions within the payment terminal. A terminal chip performs general functionality of the payment terminal while a transaction chip communicates with payment devices such as chip cards and NFC payment devices and processes payment information. The transaction chip may operate in a low power during which communications and processing are limited, and a transaction processing mode in which transactions may be processed. The transaction chip may transfer between these modes based on wake-up messages provided by other devices or circuitry of the payment terminal.

Abstract: A payment terminal may receive a request to process electronic payment information from a payment card in a swipe mode. The payment terminal may provide an opt-in request. If a user accepts, the payment terminal may receive a payment transaction request and electronic payment information of a swipe payment type from the payment card at a swipe interface. The payment terminal may determine whether the payment card is a chip card and generate a swipe mode processing indicator. The swipe mode indicator may allow processing of electronic payment information using procedures for the swipe payment type. The payment terminal may transmit the swipe mode processing indicator and electronic payment information to a payment server from a communication interface of the payment terminal, and may receive a payment approval response based on the swipe mode processing indicator.

Abstract: A payment terminal may receive a request to process electronic payment information from a chip card in an expedited processing mode. The payment terminal may provide an opt-in request. If a user accepts, the payment terminal may receive a request for payment and request an electronic payment response from the chip card. The payment terminal may receive the electronic payment response from the chip card and store it in memory at the payment terminal. The payment terminal may approve the payment transaction associated with the electronic payment response, allowing the chip card to be removed from the payment terminal. The payment terminal may process additional requests for payment and associate payment-type and time indicators with each electronic payment response. The payment terminal may transmit approval requests to one or more payment servers when the terminal determines they may be transmitted, and, for each request, receive a payment approval response.

Abstract: In some examples, a merchant device at a point of sale (POS) location may present information to a merchant in a first language preferred by the merchant, and may present information to a buyer in a second language preferred by the buyer. The merchant device may switch between the different languages in response to detecting a change in the physical orientation of a display. For instance, in a first orientation in which the display is viewable from a merchant direction, the merchant device may present information in the language preferred by the merchant. When the orientation of the display is changed to a second orientation in which the display is viewable from a buyer direction, the merchant device may present information in the language indicated to be preferred by the buyer. Various techniques may be used for determining the preferred language of a particular buyer.

Abstract: In some examples, a merchant device at a point of sale (POS) location may present information to a merchant in a first language preferred by the merchant, and may present information to a buyer in a second language preferred by the buyer. The merchant device may switch between the different languages in response to detecting a change in the physical orientation of a display. For instance, in a first orientation in which the display is viewable from a merchant direction, the merchant device may present information in the language preferred by the merchant. When the orientation of the display is changed to a second orientation in which the display is viewable from a buyer direction, the merchant device may present information in the language indicated to be preferred by the buyer. Various techniques may be used for determining the preferred language of a particular buyer.

Abstract: A social networking system acts as a platform for distributing deals from one or more deal providers. The users of the social networking system can interact with information describing the deals via a dashboard user interface provided by the social networking system. When users purchase deals on the social networking system's platform, the social networking system receives a portion of the deal price called the platform share and compensates the users for purchasing deals via the social networking system. The compensation may be funded from the revenue received by the social networking system for the purchases (the platform share). The compensation provided to a user may depend on social information associated with the user, such as the number of the user's connections also participating in the deal.