Where should I apply for amazon music service authorization?
Calling LWA for use with Amazon Music
The LWA documentation above will guide you through the authorization process that applies to your specific application. The Amazon Music-specific component of this process is scope. When you make a device authorization request to LWA you must specify a scope. You can request more than one scope at once: simply separate scopes with spaces. Which scope(s) you need depends on the API functionality you will need access to. While the Web API makes use of a number of different scopes, the Device API only requires one scope:
The Security Profile ID(s) used by Music client applications must be enabled by the Amazon Music Service in order for authorization to be successful.