Pay by palm technology raises security worries News that Amazon in trialling palm-scanning technology at one of its Whole Food stores in Seattle is raising privacy concerns, due to the fact that the technology Amazon is using links a customerâs palm signature with their credit details. The contactless payment method, known as Amazon One, involves customers enrolling their palms in Amazonâs system to make payments with a palm âsignatureâ which is linked to their credit cards. The technology works by analysing the bones, creases and other structures beneath the userâs palm, and payments can be made by simply holding their hand over a reader device.