Media access

curl "https://api.refmatter.com/v1/media/$MEDIA_ID/download-url" \
  -H "Authorization: Bearer $REFMATTER_API_KEY"

{
  "mediaId": "01a0a04b-…",
  "downloadUrl": "https://…r2.cloudflarestorage.com/…?X-Amz-Signature=…",
  "expiresAt": "2026-09-14T14:27:00.000Z",
  "contentType": "video/mp4",
  "filename": "jNQXAC9IVRw.mp4"
}