[inopinatus]

That’s actually pretty common for payment systems where you care about the journal balancing but every account is basically a liability because it’s all someone else’s money.

You just end up with an apparently negative balance in the income account that represents your own cut due to fees etc. From the GL point of view it looks like a subledger with a contra account but that’s nothing to faze a competent accountant. Back in the 13th century it was probably tricky to represent on an abacus, not so much now.