It's not always that simple. Making several thousand payments totalling as much as $100m is not "clicking a button". The process of making those transfers could be days or even weeks long. Payroll processes and the actual transacting involved typically take at least a few days.
I clicked that "Pay Now" button in my business. Nothing really that complex there, once the amounts are calculated (usually by automated programs). The rest is just regular ACH transfers, which take 2 business days to clear.
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