Which function is NOT performed by the site controller?

The function that is not performed by the site controller is scanning barcodes for sales.

The primary role of a site controller is to manage and facilitate tasks central to the operation of the payment systems and terminals, including reporting, site peripheral integration, and card processing. Reporting involves generating insights and performance metrics related to transaction activity. Site peripheral integration includes connecting and managing various devices like printers or RFID readers in conjunction with the payment system, while card processing focuses on handling and managing electronic payments from customers.

On the other hand, scanning barcodes is typically a function of point-of-sale (POS) systems or devices specifically designed for inventory management and sales transactions. This task usually falls to a dedicated hardware component such as a barcode scanner that interfaces with the POS. The site controller does not directly handle the physical scanning of barcodes, thus making it distinct from the other functions it performs.