This small module generates a barcode in QR format containing the user ID of the currently logged-in user.
TheQRcode contains the value xxxxx (where xxxxx is the username of the logged-in user). The module can also display the human-readable translation of the QRcode as well as the text value of the logged-in user's account; these settings can be changed if they do not suit your purposes.
If the visitor to the site is not logged-in the module generates the string "Please login first" with a link to the site's login form.
Note: the QRcode generation relies on an extended jQuery library—based on an idea by that may be incompatible with other Joomla Javascript features on some web pages. It is recommended that the module be placed on pages that are "light" in Javascript functionality..
Read more https://extensions.joomla.org/browse/new/extension/contacts-and-feedback/contact-details/qr-user
