We have developed Virtuemart QR code plugin for Virtuemart Order invoices .
For demo url of the invoice, please visit this Example Invoice link.You can select QR Code Image size and it puts Text and Order Number of the sold product to QR Codes Image in the invoice.
QR code, or Quick Response code, is a type of readable code originally used to track automotive parts. It is mostly limited in Japan and South Korea for several years but now, it is gaining attention worldwide. Currently, QR code is mainly utilized to advertise site/product offline.
With smartphones and other mobile gadgets which governed the modern world, QR code can be scanned by them easily, which makes it a real convenient storage of information. Data that can be encoded in a QR code ranges from a simple e-mail address, a simple text, to long winding web addresses, phone numbers, and even PayPal information.
How to use it.
just place this code
your site/ index.php?option=com_virtuemart&view=user&task=editshop
on invoice tab please image
put there basic options
QR Code image size 150
QR Code Text - Order Nbr:
I used joomla 2.5.18 and virtuemart 2.0.26