With the module "Customer Loyalty" you have the possibility to index existing customers by QR-code. This allows you to print customer cards and identify your customers by scanning a QR-Code.
In the Restaurant Manager (cloud.gastrofix.com), navigate to the "Customers" tab ("Operator" --> "Customers" --> "Customers").
Click on the "Edit" button to view the QR-Codes.
Each created customer automatically receives a QR-Code, which you can copy. If you have several customers in the database, you can generate a list with all codes via "Download QR Codes".