If you want to work for Amazon:

According to the Flex site, you’ll need to be at least 21 years old, have a car, and valid drivers license. You’ll also need some type of Android phone and pass a background check.

If you want to buy from Amazon:

The Prime Now service offers deliveries in one or two hours after being placed through a companion iPhone app. You have to be a member of the Amazon Prime service, which costs $99 per year and comes with a number of other benefits that can be accessed on your iPhone or iPad.

See what I mean? Read more about it here.