apologies, should have made it clear.
Displaybarcode and mergebarcode all shows the QR code , and as you scroll through the records you can see the QR changing.
The problem is that if you merge to email the QR code does not come through.

What if I have the QR code as a html ?

<img src='https://chart.googleapis.com/chart?chs=200x200&cht=qr&chl=1234567890' />