Comment by jes5199

the systems I’ve worked on that use your design end up in a state I call “the zoo” - because you never actually have simple transactions like you’re imagining. You end up with one object for credit card payments with stripe fees, another one for purchases with taxes, another one for ACH payouts, all meaning different things

double entry is actually the simplest projection of any possible billing system because anything that moves money can be described as a bundle of credits and debits that happen simultaneously and sum to zero. so you get accounts for taxes collected and fees charged automatically and don’t have to write custom logic for each thing