Whole Foods shoppers in Seattle will soon have a new way to pay for groceries: their palm.

Amazon announced Wednesday plans to expand Amazon One, its contactless payment service, to a Whole Foods store in Seattle and will add the feature to seven more stores there in the coming months.

Consumers can sign up for the service at participating stores. Customers insert their credit card, then hold their palm over the One device to link it to their card. They can opt to scan one or both palms, Amazon says.