Now through July 17th, 2018 (at midnight), Prime members who spend $10 at Whole Foods Market stores will receive a $10 credit on Amazon.com which can be used on Prime Day (36 hours starting at 3pm July 17th). The credit is valid on a single transaction but you cannot use it towards Amazon Gift Cards.
The $10 credit will be automatically applied to your Amazon account when you shop for deals on Prime Day. It will be designated as “Whole Foods -$10.”
In order to receive the credit, the Prime Code, which you can get here, or your linked phone number must be provided at checkout.