code: def get_access_key(self):
          
          access_key = self.get_as_nullable_string("access_key")
          access_key = access_key if access_key != None else self.get_as_nullable_string("access_key")
          return access_key
docs: Gets the application secret key.
          The value can be stored in parameters "access_key", "client_key" or "secret_key".
  
          :return: the application secret key.