curl --request POST \
  --url https://api.pal.ai/v1/documents \
  --header 'Content-Type: application/json' \
  --data '
{
  "content": "<string>",
  "id": "<string>",
  "title": "<string>",
  "url": "<string>",
  "contentType": "<string>",
  "metadata": {
    "{{metadataKey}}": "<string>"
  }
}
'

{
  "content": "<string>",
  "id": "<string>",
  "title": "<string>",
  "url": "<string>",
  "contentType": "<string>",
  "metadata": {
    "{{metadataKey}}": "<string>"
  }
}