Alexa uses the payment method you've setup for Amazon's one-click ordering and if you aren't happy with the item when it arrives, you can always send it back free of charge. The company says the virtual assistant's new skill allows it to sort through tens of millions of listings based on voice cues from an Echo, Echo Dot, Tap or Fire TV. All you have to do is say "Alexa, order me" whatever you're after and the software does the rest, as long as you have a Prime membership.