Going digital with loyalty cards and more

It's the 21st century, and many companies are looking for consumer loyalty, and pretty much every organization offers them or has gift cards. I recently upgraded my phone to the Google Nexus 6P. With the various loyalty, debit & credit cards, my wallet was jam packed, so I was looking for an app that worked with my phone. I logged into the Google App store hoping to relieve some stress on my wallet. I've tried a few of the one's that were free or free trials, I've added the cards into the apps. I went to use the app but the companies scanners can't read the bar codes. Has anyone else had this problem with their Google Nexus 6P, and have you found any resolution? Your feedback is greatly appreciated.