Api authentication for loading script

Hello HF community. I am trying to build loading script by means of HF dataset guide. I uploaded my dataset files on my github as private repo. But i can not set api authentication for following code snippets. How can i solve this? If you have any idea, i would be grateful.

def _split_generators(self, dl_manager):
    downloaded_files = dl_manager.download_and_extract(_URLS)