code: def credentials(credentials_override = nil)
        result = super(credentials_override)
        validate_headers_for_server(result)
        include_utils = @config.read('library.include_utilities_in_user_agent',
            true)
        result[:extra_headers] = {
            'applicationName' => generate_user_agent([], include_utils),
            'networkCode' => result[:network_code]
        }
        return result
      end
docs: Create the list of credentials to be used by the auth handler for header
   generation.