Patent attributes
Using contactless cards to pay for offline transactions. An application executing on a mobile device may receive, via a communications interface of a contactless card, an account identifier of the contactless card, and transaction data received by the contactless card from a POS device via the communications interface, the transaction data comprising at least an identifier of a merchant account, a timestamp, and an amount of the transaction, a network connection between the POS device and a payment server not available. The application may transmit the account identifier and the transaction data to the payment server via a cellular network connection of the mobile device. The mobile device may receive, from the payment server via the cellular network connection, authorization of a payment for the transaction. The application may generate a graphical indication of the authorization of the payment for the transaction and output the graphical indication of the authorization.