2. The cashier is busy scanning, you don't need to mention anything.
3. FaceID unlocks it automatically.
4. What Amazon app? I use the Whole Foods app. I keep it easily accessible, I don't need to find it.
5. The code is always displayed by default when you open the app. You never have to dig around anything.
6. Or scan it yourself under the customer-facing scanner they have for that.