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Now multiply that number by 2% which is about what stripe charges per transaction. Pretty nice revenue

They have to pay credit card company from it.

Ah, of course, they make no money per transaction hence.

No, but they don't get to take the full 2% that VISA/MC charge vendors.

You have to subtract interchange fees from that.

To be fair, GP did say "revenue", not "profit".

Probably not actually treated as revenue. Those charges get netted out before they’re reported as revenue (interchange is a “contra” revenue line)

Wells Fargo, as their acquiring bank, pulls the fees prior to remitting the funds to them.