Hi hello to all, congratulation to a perfect manual how to do. thank you very much. I encountered only a small problem, before I search like crazy, maybe there is a fast solution: I put the shortcode inside a new page, everything works, except that the QR code picture fills out the whole page. I changed the page design to 2 sidebars with 60% for content, here it is a little better, but still to big to scan the image.
Thank you for helping