Palm-scanning payment systems now verify age and buy alcohol at Amazon and Coors Field.

Amazon One, the palm-based payment system, will now allow users to purchase alcohol by uploading a government-issued ID on the Amazon One website. Bartenders can verify the user's age through a "21+" message and a visual match of the user with a user-uploaded photo. The Coors Field baseball stadium in Denver will be the first to let attendees use Amazon One to purchase alcohol. The system has faced pushback from privacy advocates, but Amazon argues that palm recognition is more private than other biometric systems.