curl --request POST \
  --url https://api.example.com/api/v1/personalize/preview \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "lead_data": {},
  "sender_profile_id": "<string>",
  "sender_data": {},
  "custom_prompt": "<string>",
  "research_context": "<string>",
  "dataset_id": "<string>",
  "row_index": 1,
  "force_refresh_research": false
}
'

{
  "subject": "<string>",
  "email_body": "<string>",
  "commonality": {
    "text": "<string>",
    "confidence_score": 123,
    "rarity_score": 123,
    "relevance_score": 123,
    "supporting_evidence": [
      "<string>"
    ]
  },
  "prompt_source": "<string>",
  "model_used": "<string>",
  "latency_ms": 123,
  "research_sources": [
    {
      "name": "<string>",
      "status": "<string>",
      "summary": "",
      "meta": {},
      "from_cache": false
    }
  ],
  "research_chars": 0,
  "research_latency_ms": 0,
  "research_from_cache": false,
  "research_cached_at": "<string>",
  "research_meta": {}
}