I use Staff on time v2.8.8. with a fingerprint USB terminal. One of my workers can't use the fingerprint (never works). Is it possible to use it with a code number (for him only)?
No, you can't use Staff on time with a code number. The utility allows you to add an ID number to your employees, but that code is only for rapid database searches using fingerprints. For further information, I suggest you check the official user guide. Also, you can use the contact information from the official web page to get in touch with the Support team.
