There are 2 kinds of devices in PingID SDK:
A trusted device is any device which a user paired with PingID SDK. A user may have multiple trusted devices, as configured by the administrator, up to a maximum of 15 per application.A user may choose only one primary device from his trusted devices.
To manage Trusted Devices, refer to User Devices API.
A seen device is any device used by the user to access an application, except for the current primary and trusted devices.
To manage Seen Devices, refer to Seen Devices API.