I mistrust a 3rd party's intervention, even more of a spam generator, privacy schemerThe app I use is called CardStar: https://itunes.apple.com/us/app/cardstar/id301460311?mt=8I've never received spam from them. Since they don't have my email address, I don't really know how they could send me spam, even if they wanted to.... Are they certified in any way for ID theft, Bonded?What is the risk? Store loyalty cards can't be used to spend money or access your account. They just get you a discount. Even if someone finds your card and starts using it, all that will happen is that they might get a discount, or earn some points for you!