Yes I did that once a few years ago as a test and have forgotten how to do it again now...lol... but I saw people on the Hivefest Mexico scanning a barcode from an eftpos machine right from their keychain app, so I was just wondering that's all.
And the more that I have thought about it, the more I want to forget about it because I want to keep it in here and keep building it up anyway...So it's all good- especially if you want to do the same thing too.