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
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
Create the list of credentials to be used by the auth handler for header
 generation.