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It’s probably less now though because we’ve seen a macro shift to debit from credit this year, which are cheaper to process and have much lower interchange fees, so processors that charge a fixed fee are keeping more of every transaction.

>About 15-30 bps go to the card networks

Sorry, I'm not familiar with 'bps' in this context. Techie me read that with no pause as 15-30 bits per second, and then had to slow down as that did not make sense within context.

BPS = basis points

A basis point is a hundredth of one percent:

0.0001

Any idea how much of that 1.8% that issuing banks charge goes back to cardholders in the form of rewards and cash back?

a good portion of it