code: def get_api_key_with_prefix(self, identifier):
          
          if self.api_key.get(identifier) and self.api_key_prefix.get(identifier):
              return self.api_key_prefix[identifier] + ' ' + self.api_key[identifier]
          elif self.api_key.get(identifier):
              return self.api_key[identifier]
docs: Gets API key (with prefix if set).
  
          :param identifier: The identifier of apiKey.
          :return: The token for api key authentication.