// Uses base_url, authorization and request() from Authentication.
const response = await fetch(base_url + "/courses", {
  method: "POST",
  headers: {
    Authorization: authorization,
    "Content-Type": "application/json",
    "Idempotency-Key": "staff-training-v2"
  },
  body: JSON.stringify({
    fetch_url: "https://your-storage.com/training-v2.zip",
    canonical_url: "https://your-storage.com/training-v2.zip",
    title: "Staff training"
  })
});
let course = await response.json();
if (!response.ok) throw new Error(course.error);
while (course.status !== "ready" && course.status !== "failed") {
  await new Promise(resolve => setTimeout(resolve, 2000));
  course = await request("/courses/" + encodeURIComponent(course.course_id));
}
if (course.status === "failed") throw new Error(course.error);
console.log("Ready to play:", course.course_id);