Why would anyone waste an eight-way processor on
one-card-at-a-time batch.

That reminded me of bank check-clearing operations. Check readers process 1 check at a time, building "batches" which are subsequently posted against accounts. Clearinghouses still accumulate debit and credit card transactions then route them to financial institutions in batches. Payrolls generate batches of ACH transactions, which are submitted to clearinghouses. ACH transaction received by financial institutions are posted as batches and allocated to various deposit and loan accounts. Batches of email notices and confirmations are generated based on ...

A lot of batch operations are part of End of Day, End of Month, End of Period processing.

-Nathan

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