What kind of barcode scanner?

The barcode scanner should be directly connected to the computer you are using as a POS. There aren’t any other requirements, so you have the full range of choice here.

Enabling the use of a scanner

Go to the overview of registers, and edit the relevant register. Within these settings, you’ll find the option to enable the use of a barcode scanner for this register. Once it is enabled here, a toggle appears at the top of the regular open register page. This is how you activate and deactivate the scanner in daily use, so you can be sure the scanner can’t be used to accidentally scan things.

Preparing products for a scanner

Products must have a barcode listed in the product settings, so the POS can match the scanned barcode to an actual product. Edit a product to add a barcode number.
You can enter the existing barcode number on the product, or you can create your own barcodes. If you create your own, you’ll get a PDF containing printable barcodes.
You can then use a label printer to create barcode stickers for your products.

Using the scanner

Make sure the steps mentioned above have been completed, and set the toggle to active. Scan a product, and watch it appear on the receipt. Scanning a product twice will put two of that item on the receipt. If you accidentally scan something too many times, manually adjust the receipt line to reflect the correct number.