Why do we need to know the flow of campaign funds?

Prince Khairul Saleh
Chairman of the Regional People's Representative Council of Banjar Regency (2019–2024)
Khairul Saleh (born January 5, 1964), also known by his regnal name, al-Mu'tashim Billah, is the Sultan of Banjar who has been in power since 2010, and the regent of Banjar Regency who served from 2005 to 2015. Currently, he is a member of the People's Consultative Assembly of the Republic of Indonesia since 2019 representing the electoral district of South Kalimantan I. Source: Wikipedia