code: def api_key(self, api_key):
          
          if api_key is None:
              raise ValueError("Invalid value for `api_key`, must not be `None`")
          if api_key is not None and len(api_key) > 1000:
              raise ValueError("Invalid value for `api_key`, length must be less than or equal to `1000`")
  
          self._api_key = api_key
docs: Sets the api_key of this GlobalSignCredentials.
          Unique ID for API client (provided by GlobalSign). 
  
          :param api_key: The api_key of this GlobalSignCredentials.
          :type: str