I thought about that too. Someone has to have a merchant account, so it's possible all of the payments go through Square and they act as a clearing house where

I thought about that too. Someone has to have a merchant account, so it's possible all of the payments go through Square and they act as a clearing house where they redirect payment to the correct merchant. I could see that leaving them vulnerable to chargebacks. I wonder what kind of rates they're offering to users.