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Hi there, I'd suggest you check out our 'Login with Amazon' which may be able to assist further: https://developer.amazon.com/public/apis/engage/login-with-amazon Also, please check out the following link for more info on authorization grants: https://developer.amazon.com/public/apis/engage/login-with-amazon/docs/authorization_grants.html Regardless, if you are still having issues, contact us on clouddrive-api-support@amazon.com where we should be able to assist further. Regards, Jamie

Thank you, Jamie. The problem is the application with redirect set to http://127.0.0.1/ returns Error Code: 400 Error Message: The redirect URI you provided has not been whitelisted for your application for login request, though it has been whitelisted via whitelist request form. Therefore client is not redirected to localhost http server temporarily started by application and login does not happen. Could you please assist with it?

Well. I found answer myself. It is important to activate "Login with Amazon" within your developer profile. After that you will get access to "Web settings" tab in your security profile.