You can generate a QR code for the page in the «Content» section, by clicking the corresponding button next to the link to your page.
Also, a QR code with a link to the page can be generated in any convenient application.
A QR code is simply a way of displaying information. You can write the link on the business card in text, or you can encode it through a QR code. It's just that in one case it will be easier for a human to read the link, in another - for a machine. A good practice is to write link in text next to the code.