Until last week, I had an iPhone 5S and an Apple Watch, which is also a combination that works for paying with Apple Pay. I tried several places that claimed to

Until last week, I had an iPhone 5S and an Apple Watch, which is also a combination that works for paying with Apple Pay. I tried several places that claimed to support it, and it didn't appear to work. It took me several months to realize that I had to have the "Wallet" app open on the watch and had to double-click the side button to put the watch in the mode where it's ready to pay. Then you have to get it close to the terminal to work. I bet half the problem is that users don't know the interface for making a payment. My memory of the keynote where this was introduced was that you just held the watch up to the terminal and it paid. That's not the reality of how it works. And cashiers generally don't know how it works, so they can't help you.