In Amazon's case you don't even need that, you just need to click a button. Yes, that was the point of the thread. On Amazon's site, order cancellations are

In Amazon's case you don't even need that, you just need to click a button. Yes, that was the point of the thread. On Amazon's site, order cancellations are automated and can be done on the website, while for many other online stores you have to contact a human to do it manually.