You know, that stuff you do out of hours, in the evenings or at the weekends. The stuff you put off to the last minute because it gets in the way of ‘doing the real work’ - even if it means you get paid late.
Except there is no such thing.
Your business is a single end-to-end Process of sharing your Promise of Value with the person who wants to hear it, then delivering on that Promise once they have signed up for it.
That person has agreed to pay you money in exchange. Taking payment (however you do it) is part of the service.
Everything else is a side-effect.