A person considered a religious successor to the Islamic prophet Muhammad (Muhammad ibn ʿAbdullāh) and a leader of the entire Muslim community would have used what financial institution?
Bayt al-mal Bayt al-mal (بيت المال ) is an Arabic term that is translated as "House of money" or "House of Wealth." Historically, it was a financial institution responsible for the administration of taxes in Islamic states, particularly in the early Islamic Caliphate. It served as a royal treasury for the caliphs and sultans, managing personal finances and government expenditures. Further, it administered distributions of zakat revenues for public works. Modern Islamic economists deem the institutional framework appropriate for contemporary Islamic societies.
Muhammadite Shia The Muhammadite Shia (named for Muhammad ibn Ali al-Hadi) were a Shia sect who believed that due to the supposed lack of a son (according to their opinion) for Hasan al-Askari, they had to rethink the legitimacy of his Imamate. Therefore, they instead believed in the Imamate of his brother Muhammad ibn Ali al-Hadi, who died 7 years before the death of his father. However, the Muhammadites denied the death of Muhammad, and claimed that his father had pointed to him and appointed him as the Imam to succeed himself, and had mentioned him by his name and person. These beliefs, falsely according to them, are what were agreed by all.