curl --request POST \
  --url https://rankyak.com/api/v1/articles/{article}/external-url \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --data '
{
  "external_url": "https://example.com/posts/123"
}
'

{
  "id": 123,
  "slug": "<string>",
  "excerpt": "<string>",
  "title": "<string>",
  "meta_title": "<string>",
  "meta_description": "<string>",
  "html": "<string>",
  "markdown": "<string>",
  "header_image_url": "<string>",
  "publish_at": "2023-11-07T05:31:56Z",
  "published_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z"
}