FWIW I had an e-commerce product offering one click buying from dynamic banner ads (!) before Amazon had one click buying. I think it was obvious at the time,

FWIW I had an e-commerce product offering one click buying from dynamic banner ads (!) before Amazon had one click buying. I think it was obvious at the time, and cannot fathom why other stores didn’t try it earlier except perhaps fraud fears. Separately, Amazon is often no longer one-click, which will bite you when you think you ordered but were instead on a supplemental question page you clicked back from without reading. Super annoying when the product doesn’t show up 2 days later.