I'd like to add a question to this. I know that "signature based transactions" are processed through VISA and subject to zero liability, and I know that ATM transactions are not. However, what about when I use my debit card at a merchant, but I put in my PIN number rather than signing it? It's not an ATM transactions; however it is PIN based so does that mean it isn't processed through VISA? If so, how would we as the bank know whether or not the transaction was signature or PIN based?
Sorry for all the questions, any help would be much appreciated!