Handling errors

const res = await fetch("https://api.ringup.dev/v1/charge", { /* … */ });

if (!res.ok) {
  const { error } = await res.json();

  // A caller can act on this: say the sentence we wrote, and follow the move.
  if (error.audience === "caller") {
    speak(error.agent_message);
    if (error.agent_action === "send_link") await sendPayLink();
    return;
  }

  // A developer error is yours, not theirs. Log it with the request id and handle the
  // call however your product handles an outage.
  log.error({ code: error.code, param: error.param, request_id: error.request_id });
  return;
}