My daughter turned me on to this app, this past weekend. All you have to do is download all your loyalty cards and library card. One can just take picture of your bar codes and attached to each loyalty card. Then save and you are Ready To Go.
How does it work? The next time you go to CVS or IKEA, just go to the app on your phone it will list all them, just click on the one you want (they are in alphabetical order) and then click on the lower right hand corner and your bar code will appear at the top of your phone. Then just stick it under the bar scanner and bingo you are done. Easy as pie. Saves your key ring from being over loaded and your ignition too.