Devices are the mobile phones and tablets merchants register to accept Tap to Pay payments.

Each device record tracks a device name, its last login time, and the API key used to activate it.
A device also carries a Tap to Pay status, which controls whether it can process contactless card payments.
That status moves through five states: Inactive, Requested, Approved, Active, and Denied.

The Devices endpoints support listing devices, registering them, and activating Tap to Pay on each one.
A merchant can list all registered devices or retrieve a single device by its identifier.
Registering a device requires only a device ID and a device name.
A separate endpoint activates Tap to Pay, and another generates the token a device needs to process a transaction.

* GET /pay-api/v1/devices.
Lists every device currently registered to the merchant account.
* GET /pay-api/v1/devices/{deviceId}.
Retrieves a single device by its identifier.
* POST /pay-api/v1/devices.
Creates a new device, or updates an existing one, by device ID.
* POST /pay-api/v1/devices/{deviceId}/tap-to-pay/activate.
Activates the Tap to Pay feature on that specific device.
* POST /pay-api/v1/devices/tap-to-pay/jwt.
Generates the token a device needs to process a Tap to Pay transaction.