I have no vested interest in selling billing products, and my experience is that billing is somewhat unique in the delta between how hard people who have never

I have no vested interest in selling billing products, and my experience is that billing is somewhat unique in the delta between how hard people who have never done it THINK it is, and how hard it actually is. There are many hard things that appear simple, but time and time again I have seen inexperienced engineers be caught off guard by just how much harder billing is than it looks.