curl --request POST \
  --url https://brew.new/api/send/transactional \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "chatId": "abc123",
  "to": "user@example.com",
  "variables": {
    "firstName": "John",
    "orderNumber": "ORD-12345",
    "trackingUrl": "https://example.com/track/xyz"
  }
}
'

{
  "success": true,
  "data": {
    "sent": 123,
    "failed": 123,
    "dropped": 123,
    "results": [
      {
        "email": "<string>",
        "id": "<string>",
        "error": "<string>"
      }
    ],
    "droppedRecipients": [
      {
        "email": "<string>",
        "reason": "<string>"
      }
    ]
  },
  "warning": {
    "code": "RECIPIENTS_DROPPED",
    "message": "<string>"
  },
  "meta": {
    "requestId": "<string>"
  }
}