This error implies that the Terminal device has been unlinked from your Paystack business and can't process payments. This error might also appear as a result of a wrong date and time on your Terminal device.
To troubleshoot this, kindly check the date and time on the device, then restart the device and try again.
If the issue persists, reach us at firstname.lastname@example.org with the device serial number and your business ID (the 6 digits at the top-left corner of your Paystack Dashboard). A member of our team will be in touch to help.