code: def register_site(self):
          
          if self.oxd_id:
              logger.info('Client is already registered. ID: %s', self.oxd_id)
              return self.oxd_id
  
          # add required params for the command
          params = {
              "authorization_redirect_uri": self.authorization_redirect_uri,
  			"oxd_rp_programming_language": "python",
              }
  
          # add other optional params if they exist in config
          for op in self.opt_params:
              if self.config.get("client", op):
                  params[op] = self.config.get("client", op)
  
          for olp in self.opt_list_params:
              if self.config.get("client", olp):
                  params[olp] = self.config.get("client", olp).split(",")
  
          logger.debug("Sending command `register_site` with params %s", params)
          response = self.msgr.request("register_site", **params)
          logger.debug("Received response: %s", response)
  
          if response['status'] == 'error':
              raise OxdServerError(response['data'])
  
          self.oxd_id = response["data"]["oxd_id"]
          self.config.set("oxd", "id", self.oxd_id)
          logger.info("Site registration successful. Oxd ID: %s", self.oxd_id)
          return self.oxd_id
docs: Function to register the site and generate a unique ID for the site
  
          Returns:
              **string:** The ID of the site (also called client id) if the registration is successful
  
          Raises:
              **OxdServerError:** If the site registration fails.