is there a charge to download a QR SCANNER 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

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

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