curl --request GET \
  --url https://api.simplicity.ai/v1/documents/{document_id} \
  --header 'X-API-Key: <api-key>'

{
  "document_id": "<string>",
  "file_key": "<string>",
  "extension": "<string>",
  "original_filename": "<string>",
  "document_type": "SOURCE_DOCUMENT",
  "original_document_url": "<string>",
  "presigned_url": "<string>",
  "metadata": {
    "title": "<string>",
    "keywords": [
      "<string>"
    ],
    "total_pages": 123,
    "file_size": 123,
    "file_type": "PDF"
  },
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z"
}