[pbiggar]

I'm talking about using 3rdparty APIs, like Twilio or Stripe or something, that we don't have control over and that we need to handle. So we want it to feel like calling functions, though in practice it needs to be able to handle all the stuff that goes wrong.

Can you link to something about message passing? I'm familiar with a concept with this name, but I don't quite see what you mean.