The only ZBA acronym can find is Zero Balance Account, a business term. There are others here however don't seem to fit?
https://www.acronymfinder .com/ZBA.html
What is a 'Zero Balance Account - ZBA'
A zero balance account (ZBA) is a checking account in which a balance of zero is maintained by automatically transferring funds from a master account in an amount only large enough to cover checks presented. A ZBA is used by corporations to eliminate excess balances in separate accounts and maintain greater control over disbursements.
https://www.investopedia.com /terms/z/zba.asp