[1] The first is a core banking facility directed at maintaining a core group of accounts that the government is legally required to hold at the Reserve Bank. Maintaining central government core accounts is a service that almost all central banks provide, though arrangements vary from country to country.
https://www.rba.gov.au/speeches/2018/sp-ag-2018-08-23.html  1/7  23/08/2018  The Reserve Bank's Government Banking Business | Speeches | RBA  The second component is a transactional banking facility. This is an account and transaction service available to government agencies to assist in undertaking their policy responsibilities and day-to-day operating expenses. [2] Unlike core banking, transactional banking is not a service universally provided by central banks.