curl --request POST \
  --url https://api-{dc}.moengage.com/v5/personalizations/previews \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "request_id": "req-8841",
  "personalization_content": {
    "payload": {
      "subject": "Hello {{UserAttribute[\"first_name\"] | default(\"there\")}}",
      "body": "Welcome {{UserAttribute[\"second_name\"]}}!"
    }
  },
  "user_details": {
    "identifier": "email",
    "identifier_value": "[email protected]"
  },
  "personalization_details": {
    "channel": "EMAIL",
    "event_name": "MOE_APP_OPENED",
    "user_attributes": {
      "first_name": "Ada"
    }
  }
}
'

{
  "personalized_content": {
    "payload": {
      "subject": "Hello Ada",
      "body": "Welcome Ada!"
    }
  }
}