Where do prohibited businesses get online payments?

Do we know the names of these payment providers? I have no doubt the porn industry must have a slew of companies supporting them.

Bitcoin (through Coinbase). I produce adult games mostly as a hobby, but last year received several thousand dollars in bitcoin (not counting the price increase).

If I were serious about making money or leaving my day job I'd have to accept credit cards in some form, but for now I'm happier not having to deal with all the hooplah of setting up a merchant account etc.