Think about the last time you hired a lawyer, visited a doctor, or brought in a consultant to fix a business problem. Chances are, you paid them using one of the oldest and most straightforward business models in existence: fee-for-service. Unlike subscriptions where customers pay monthly whether they use the service or not, or product sales where you buy something once and it's yours forever, the fee-for-service model is elegantly simple: you provide a specific service, and