Patent attributes
In some examples, a system receives, from a first device, an indication of a location of the first device and a notification of a transaction including an identifier that identifies both a customer and a second device associated with the customer. The system may send information related to the notification to cause the second device to present details related to the transaction. The system may receive, from the second device, an indication of a location of the second device, and may determine that the first device is in proximity to the second device by comparing the location of the first device to the location of the second device. The system may submit, to a payment processor, information related to the transaction and the determination of proximity for authentication to enable the payment processor to determine whether to approve the transaction based at least on the determination of proximity.