Amazon prime is tied to your credit card. One single action to pay: tap credit card against reader

Why do you have so many hoops to jump through like presenting QR code and tapping watch

I would love that, but it doesn't seem to happen for me if I use the credit card that I have linked to my Amazon Prime membership as the payment method. When I tap it doesn't recognize my Prime membership. Do you have the Amazon Prime credit card perhaps?

The reason why I did the QR code and watch tap thing prior to the palm thing is that I didn't want to carry a single-use credit card.

I'd love the functionality you're talking about. Do you remember how you set it up to get that? Would love to have my grocery card automatically recognized as being linked to a Prime membership.