const response = await fetch(base_url + "/courses", {
  method: "POST",
  headers: {
    Authorization: authorization,
    "Content-Type": "application/json",
    "Idempotency-Key": "your-lms-content-version-id"
  },
  body: JSON.stringify({ filename: "training.zip", size: file_size, shareable: false })
});
const course = await response.json();
if (!response.ok) throw new Error(course.error);
console.log(course.course_id, course.upload.upload_id, course.upload.part_size);