Yes thanks for the reply.
I found out that I do have it already when I searched for an app.
On my Samsung A50 it is a part of 'Bixby Vision', so I have updated that and agreed the terms and conditions etc...
Very easy to use.
Of course it needs the internet and I only use the phone to connect to the internet at home. Not when I am out.
So now I suppose I will have to get a mobile phone internet package that I don't need nor want.
I suppose I could use the pen method - that sounds a lot of effort though if I have to do it in every shop I enter in a mall.