Secure transactions with offline device

Abstract

A method being implemented via execution of computing instructions configured to run at one or more processors and stored at one or more non-transitory computer-readable media. The method can include receiving a preauthorization code at a mobile device while the mobile device is in data communication with a mobile wallet provider. The preauthorization code can include a preauthorization amount, an expiration time, and a digital signature. The method also can include storing the preauthorization code in the mobile device. The method additionally can include receiving, at the mobile device, an authorization from a user of the mobile device for a transaction having a transaction amount while the user is at a point-of-sale terminal of a first entity. The method further can include determining that the mobile device is unable to communicate with the mobile wallet provider. The method additionally can include verifying that the transaction amount is less than or equal to the preauthorization amount. The method further can include, while the mobile device is unable to communicate with the mobile wallet provider, providing a transaction code from the mobile device to the point-of-sale terminal to cause the first entity to send the transaction amount and the preauthorization code to a transaction system, and to cause the transaction system to send an approval for the transaction in real-time while the user remains at the point-of-sale terminal of the first entity. The transaction code can include the preauthorization code, a transaction identifier, and the transaction amount. Other embodiments are described.