login_admin($self, $email, $password)
Logs you in to the shop as an admin, allowing you to create and manipulate discount codes, as well as upload files into user-space (not theme space).
Doens't get around the API call limit, unfortunately.
logged_in_admin($self)
Determines whether or not you're logged in to the Shopify store as an admin.
menu_or_linklists
As of 2017-08-29, some stores will go for Menus, some for LinkList. This figures out which.