Whitelist your Client ID to access the Amazon Cloud Drive API by completing the Amazon Cloud Drive whitelist request form.
With your Amazon application in place, visit the Amazon > LoginWithAmazon bundle. Starting with the InitializeOAuth Choreo, use these Choreos to grant your application access to an Amazon Cloud Drive account. This short video demonstrates how to use our OAuth Choreos, and it's a good idea to take a break and watch it now before you dive into this step. This process will return a refresh token which can be used along with the client id and client secret to authenticate with Amazon.