"Good funds," I assume, is the rough equivalent of "available balance" (how I wish there were a regulation requiring the user of a standard set of terms for such things!). And regulators made a big stink at the end of 2016 over banks that used available balance for approving/disapproving ATM and one-time POS debits, reduced the available balance by the amount of any approved ATM or one-time POS authorization and then determined whether the account is overdrawn (triggering an OD fee) based on available balance.
I can't help but assume the "good funds" processing is concocted to assuage the concerns of those regulators.
John S. Burnett
Fighting for Compliance since 1976
Bankers' Threads User #8