To print receipts, you need to download and install
bsxPrinter software on your computer. bsxPrinter will allow you to print receipts on fiscal printers, including online. Details of supported protocols and devices can be found on the application page. The bsxPrinter software must be registered with a license key. You can find this key in the aleFaktury application. Go to user menu -> Tools-> Services:

.
Copy the key to bsxPrinter. Start the bsxPrinter application and go to Help -> Program Registration. In the "Key" field, enter the copied license key.