Preliminary BFCM stats from two of my favorite Digitally Native Vertical Payment Processors (DNVPs):
Adyen:
$34B TPV, 670M transactions, peak 163K trnx/min, 99.9999% uptime, peak 25K requests/sec
Stripe:
$26B TPV, peak 93K trnx/min, 99.999% uptime, peak 27K requests/sec