"since": self.since,
        }
        query_params_list = [
            f"{k}={v}" for k, v in query_params_dict.items() if v is not None
        ]
        query_params = "&".join(query_params_list)
        return query_params
    @property
    def url(self) -> str:
        """Create URL for GitHub API."""
        return f"{self.github_api_url}/repos/{self.repo}/issues?{self.query_params}"