is there a charge to download a QR SCANNER APP ?

Just open your iOS camera app, aim your camera to the QR code. It recognizes QR code automatically, without needing any third party app.

QR Scanner Apps Are Free

I Use A QR Scanner Myself On My IPhone And Can Confirm

Though If Your Looking At a 3rd Party One

Some Are Priced Though You Can

View The App Price On The App Store

Hope This Information Helps

-Brad

That functionality is built into iOS. There is no need to download a 3rd party app.