docs: def services(self, code=None, **kwargs):
          """
          Retrieve information about available services. You can also enter a
          specific service code argument.
  
          >>> Three().services()
          {'all': {'service_code': 'data'}}
          >>> Three().services('033')
          {'033': {'service_code': 'data'}}
          """
          data = self.get('services', code, **kwargs)
          return data