2. Is there a ban on donations from foreign interests to candidates?

"In late 2018 the Parliament passed legislation to ban political donations of $1,000 or more from foreign sources."

Source: https://www.aph.gov.au/About_Parliament/Parliamentary_Departments/Parliamentary_Library/pubs/BriefingBook46p/PoliticalFinance

"Gifts of over $1,000 to political entities (broadly, registered political parties, candidates and Senate groups) or political campaigners must not be made by foreign donors"

 Source: Section 302,Commonwealth Electoral Act, 1918 (Compilation 63).