langchain/document_loaders/iugu.py/IuguLoader/__init__
class IuguLoader:    def __init__(self, resource: str, api_token: Optional[str] = None) -> None:
        self.resource = resource
        api_token = api_token or get_from_env("api_token", "IUGU_API_TOKEN")
        self.headers = {"Authorization": f"Bearer {api_token}"}