Okay so I finally purchased my first pay application. I asked my landlord for his master card. After sometime I decide to upgrade one of my existing apps but as I got ready to type in the details again- the app simply upgraded. To be certain I bought a few more 3-4 dollar apps and they simply downloaded. My question is: is the Mastercard information saved on my account? I don't think I am very comfortable with this fact. Furthermore what if I relocate and I have to buy from my own or any other card?