27. Are there provisions requiring donations to go through the banking system?

Australian Electoral Commission, 'Obligations of Registered Political Parties'

http://www.aec.gov.au/Parties_and_Representatives/party_registration/guide/obligations.htm

'Election funding in Australian States and Territories', Dr. D. Muller, 9 November 2017

http://parlinfo.aph.gov.au/parlInfo/download/library/prspub/5621507/upload_binary/5621507.pdf

There are no specific provisions that donations must go through the banking system.  However, to complete registration as a political party there must be a party bank account and  financial returns of political parties for donations received should be substantiated with bank account statements and record keeping.  Different regulations apply for state and territory governments some regulations require a specific campaign account to receive electoral donations.  This does not apply to federal election campaigns.