Currently, Buy with Prime is limited to Fulfillment by Amazon (FBA) merchants. FBA sellers already have their inventory stored in Amazon fulfillment centers, making it easy to implement this new benefit. Your customers will experience the same trust and familiarity they associate with Amazon while shopping on your site, and you don’t have to do anything but sign up.
Link to your Amazon Pay account to offer a seamless checkout experience for Prime members. Plus, you can use Multi-Channel Fulfillment (MCF)
to streamline your fulfillment process and offer one pool of inventory for multiple channels. Buy with Prime also gives you all the necessary shopper information, including email addresses for customer orders. This means you can provide customer service and build direct relationships with your shoppers.