Originally Posted by
invisible
So debit cards in the US are using their own networks, like Star, while overseas issued debit cards use visa or MasterCard and as a result, these transactions are treated as credit card transactions by default, correct?
The latter, yes. US issued debit cards can use Visa or MC for domestic transactions as well, depending on the merchant. If PIN is prompted for US debit cards, though, it's a fairly safe bet that the store wants to use a network not Visa or MC.