To use the SkyVault REST API, your application must first be registered with the SkyVault Developer Portal.
Go to https://www.alfresco.com/develop/cloud and sign up. When your account is approved, you can register your application. You must provide a callback URL and a scope. The callback URL is the part of your application that exchanges the authorization code for an access token. The scope should always be set to public_api. call.
Once your application is approved, The Auth tab will show an API Key, and a Key Secret. These will be needed by your application for authorization.