TBM allows to generate invoices including QR code part according to Swiss standards. This feature is implemented using report template named Invoice_CH. You can find it in the list of templates, and under Print button in the invoice list:
When you select this template for printing an invoice, you can find corresponding part in the bottom of the page:
You can freely clone this predefined template to create custom invoice template containing QR part. Here, the same procedure applies as with any other default template.