This might sound like a stretch, but I wish I could just pay without having my phone or card or cash or anything else on me. In general I'm growing weary of authentication hell, but specifically with how it all seems to come back to requiring my phone. I really wouldn't mind just keying in my account number and pin to make a payment, but of course that's just username + password and I suppose unacceptably risky. The solution I expect is for Amazon to recognized my face and bill me.