Questions about Brother Mfc-L5750dw

In principle, any laser printer can print the QR code and also read it via the scanner. The QR code can be printed on white paper. It is important that the perforation lines are printed. More information can be found under this link: https://www.paymentstandards.ch/dam/downloads/ig-qr-bill-de.pdf The question is whether the invoicing software, accounting software or electronic banking software can print or process the scanned documents.

No. The trade-in offer only applies to printers and multifunction devices that come from Brother. It is actually called a loyalty bonus or loyalty promotion. See conditions of participation: https://www.brother.ch/-/media/files/bsw/promotionen-agb/dteilnahmebedingungen-eintauschprogramm20032017.pdf?la=de-ch