curl --request POST \
  --url https://api.adapter.com/v1/custom-connectors/{connector_id}/ingest \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "items": [
    {
      "external_id": "<string>",
      "data": "<unknown>",
      "metadata": {
        "batch": "2026-06-01",
        "env": "staging"
      }
    }
  ]
}
'

{
  "status": "<string>",
  "events": 123,
  "external_ids": [
    "<string>"
  ]
}