title: Google Pay does not show total price or displayItems
body: <p>I was trying to integrate Google Pay to a native Android app. I read the doc and played around with the sample project and I noticed that there is no total price displayed on the popup for Google Pay. (There is email, shipping address, card info though) I also tried in my app and it is the same. In my code, I also added <code>displayItems</code> and they are not shown either. Sorry no code is attached here. But all I wonder is whether it is normal for the Google Pay popup not to show total price or display items on the Android app, or is it because I didn't do it correctly? </p>