Energy giant Woodside has revealed the details of what corporations receive from political parties for subscribing to party fundraising ventures, in a rare peek inside the fastest growing form of political donation.

For a decade or more, both sides of politics have been working to move corporate donors away from outright donations to subscriptions or membership fees for what are described as "business fora", which entail larger annual donations for which donors receive access to a suite of events. Because such subscriptions are in exchange for a service from the party, they do not count as donations under Commonwealth electoral laws and do not have to be disclosed. It's also been rare for the specific services provided by parties to be itemised publicly.