So I was in Toys R Us today. An official Apple Pay supporter, and used Apple Pay at check out. My phone said "Done" and on the POS terminal it showed the payment method as XXXX-XXXX-XXXX-1234, but it then showed two buttons. One was for a signature, and the other for a PIN. Obviously I didn't have a PIN for this so I had to sign for it before it would accept. Why would this be the case? Also the transaction was below $25.00.