The app works fine although as of today it's still tagged Beta in the Google Play store, which may give some people pause.

NFC on the other hand is so unreliable as to moot the use of Google Pay, which is unfortunate. I really prefer tap-to-pay over anything else, but not at the expense of making people in line behind me wait as I try various workarounds like toggling NFC. I realize there's nothing you can do about it - my grumbling is more a warning to folks who (like me) may have used it previously on the Pixel 2 and loved it. It's problematic in the Pixel 4. :shrug: