We currently do not provide a connection to cash register systems. You can however use a bar code scanner.
For more info and documentation on bar code scanners and their use, see the bar code scanner support page.
It is possible however, to connect a cash register system to SEOshop through the API. The API enables developers to make a connection with a third party, which in this case also applies to cash register systems.
For more information on building an app through the API, please check the API documentation.