Amazon (AMZN) is offering customers a $10 credit for participating in its Amazon One program, a service that allows consumers to pay for their purchases using their palm prints instead of a credit card.

The Amazon One program is offered at participating Amazon Books, 4-star, and Pop Up shops throughout the U.S., including locations in New York, Washington, New Jersey, Oregon, Maryland, and Massachusetts.

Amazon first started the palm payment system in 2019, rolling out the feature in Seattle stores in September 2020.

According to the e-commerce giant, Amazon One is a “contactless identity service that makes it easier for you to move through the world with just a simple palm scan.”

It works by using the distinct features on and below the surface of your hands that are unique to each person. A proprietary image and computer vision algorithms capture and encrypt this palm image to create a specific palm signature that is read and used each time a customer makes a purchase.

Amazon said that because the palm print is unique and contains “multiple layers of distinguishing features” it is safe and a convenient Amazon One ID choice.

Amazon One technology can recognize a customer’s palm print in seconds with no need to touch anything once a person enrolls in the program as they hover over the system.

Plus, Amazon said the palm print provides privacy and security because no two palms are alike and change very little over time. Customers decide when to use their palm print with data protected at all times, which is not stored on an Amazon One device because it is cloud-based.

Customers can earn the $10 in-store credit by signing up at checkout or a kiosk, which Amazon said takes just minutes to complete. Here, they will follow the welcome text to sign in to their Amazon account or create one. An email will then be sent to claim their $10 credit to use on any products sold by Amazon.com.

Amazon One also provides targeted ads to consumers and shopping recommendations.

“Using your palm requires an intentional action by you to use our service. You decide where and when to hover your palm to use Amazon One,” Amazon said on its website.

Shares of Amazon were trading at $3,363.76 as of 1:04 p.m. ET on Wednesday, down $2.48, or 0.07%.

This undated handout photo courtesy of Amazon shows a person waving their hand above the new Amazon palm recognition payment system called "Amazon One" to be used in the company's retail locations
This undated handout photo courtesy of Amazon shows a person waving their hand above the new Amazon palm recognition payment system called "Amazon One" to be used in the company's retail locations Amazon / -