Yes, you can use the viva.com terminal on several devices simultaneously by creating a new user (employee user) for each device.

To do this, go to Settings > Users > New User in your account.

Enter the new user's details (mobile number, email, etc.).

The new user will receive an activation email and be prompted to set a password. Afterward, they can download the app from the Play Store. They must log in with their mobile number and password and start using the terminal.