code: def get_user_info(self, recipient_id, fields=None):
          
          params = {}
          if fields is not None and isinstance(fields, (list, tuple)):
              params['fields'] = ",".join(fields)
  
          params.update(self.auth_args)
  
          request_endpoint = '{0}/{1}'.format(self.graph_url, recipient_id)
          response = requests.get(request_endpoint, params=params)
          if response.status_code == 200:
              return response.json()
  
          return None
docs: Getting information about the user
          https://developers.facebook.com/docs/messenger-platform/user-profile
          Input:
            recipient_id: recipient id to send to
          Output:
            Response from API as <dict>