Since a Receiver needs to find out how to communicate with the Transmitter, it needs to know where to get an authorization token from in order to call the Transmitter endpoints, and with what scopes to request a token from that authorization server. To avoid each Transmitter having to define their own scopes for similar functionality, the spec should define a standard set of scopes that are recommended for use by Transmitters. Transmitters should be free to use other scopes if they want.
Since a Receiver needs to find out how to communicate with the Transmitter, it needs to know where to get an authorization token from in order to call the Transmitter endpoints, and with what scopes to request a token from that authorization server. To avoid each Transmitter having to define their own scopes for similar functionality, the spec should define a standard set of scopes that are recommended for use by Transmitters. Transmitters should be free to use other scopes if they want.