In this state of the library, there is everything the itch.io REST-API currently offers.
Also, there is now the `DownloadKey` class:
py
import itchio
session = itchio.Session(key)
gameCollection = itchio.GameCollection(session)
my_game = gameCollection.all()[0]
downloadKey = my_game.download_keys(user_id)
print(downloadKey.id)
124