In an old social studies book, I found a photocopy of 1972 Newspaper article about banks switching to ACH Clearinghouse payments.
ACH payments are still used today between banks. They bundle up a large number of transactions and then send the net amount to the other bank. They also email/transmit a list of transactions for that amount.
It’s not quite the same thing as debit and credit transactions flying around via merchant services. However, there is a pretty good chance your payroll is transmitted to your bank account via ACH.