For merchants with inventory in Amazon fulfillment centers, you simply need to authorize Amazon to use your inventory stored in Amazon fulfillment centers to fulfill Buy with Prime orders and offer the same fast, FREE delivery as Amazon.com. You’ll also link your Amazon Pay account to give millions of Prime members a seamless checkout experience by using the shipping and payment information stored in their Amazon account. Merchants not yet using Amazon Pay on their ecommerce site will be directed to register for Amazon Pay while configuring Buy with Prime.