Abstract: Systems and methods are disclosed for security breach notification. In one implementation, an indication of a security breach is received, at a first device with respect to a user account. Based on the indication of the security breach, a processing device generates a security breach notification, the security breach notification including an instruction to initiate at an account repository one or more actions with respect to the user account. An attempt is made to transmit the security breach notification to the account repository via a first communication interface of the first device. In response to a determination that the security breach notification was not successfully transmitted to the account repository, the security breach notification is transmitted to a second device via a second communication interface of the first device.

Abstract: Systems and methods are disclosed for multi-device authentication. In one implementation, a transaction request initiated with respect to a first device and a second device is received, each of the first device and the second device being associated with a user account. One or more transaction completion criteria associated with the user account are identified. A determination is made as to whether the one or more transaction completion criteria associated with the user account are met with respect to the first device, the second device, and the transaction request. Based on a determination that the one or more transaction completion criteria associated with the user account are met with respect to the first device, the second device, and the transaction request, the transaction request is completed.

Abstract: Systems and methods are disclosed for security breach notification. In one implementation, an indication of a security breach is received, at a first device with respect to a user account. Based on the indication of the security breach, a processing device generates a security breach notification, the security breach notification including an instruction to initiate at an account repository one or more actions with respect to the user account. An attempt is made to transmit the security breach notification to the account repository via a first communication interface of the first device. In response to a determination that the security breach notification was not successfully transmitted to the account repository, the security breach notification is transmitted to a second device via a second communication interface of the first device.