Shopify just announced new ways to connect your Shopify store to Amazon. Read more about this at New Features, New Categories: Selling on Amazon with Shopify Just Got Easier.
Want to learn more?
Click Amazon Channel for information on how to add the Amazon sales channel to your store. This article also includes information on eligibility.
To learn how to list items on Amazon, click Listing Products on the Amazon Channel and to learn how to manage those listings, click Manage Amazon Listings.
Click Fulfilling Orders on Amazon to learn how to fulfill your orders, and issue refunds.
NOTE: It’s important to note that adding the Amazon channel to your store is free, but you will need to have an Amazon Professional Seller account, which is $39.99 per month (paid to Amazon). You will also pay a referral fee to Amazon for any sales you make. The link above includes information about these fees.