Yup that's all you need for someone's grandmother, friend, or ex-husband to pay over the phone for their storage unit, then they move out and the grandmother, friend, or ex-husband tells the credit card company that it was an unauthorized charge.

Here they have to pay in person and sign, with their own card, or if a significant other is paying, they have to pay in person and sign. If they want to pay over the phone, they have to have a signed agreement in the file with the credit/debit card number(s) listed on the agreement.

They can pay over the internet however, with whatever card they want. I have no idea what safeguards are built into the internet, since I have never paid online at our facility.