curl --request POST \
  --url 'https://actionkit.useparagon.com/projects/{project_id}/actions/#KLAVIYO_ADD_SUBSCRIBER_TO_LIST' \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "action": "KLAVIYO_ADD_SUBSCRIBER_TO_LIST",
  "parameters": {
    "listId": "<string>",
    "sendingOptions": "True",
    "profileId": "<string>",
    "email": "<string>",
    "phoneNumber": "<string>",
    "firstName": "<string>",
    "lastName": "<string>",
    "title": "<string>",
    "organization": "<string>",
    "city": "<string>",
    "region": "<string>",
    "zip": "<string>",
    "country": "<string>",
    "timezone": "<string>",
    "customProperties": {}
  }
}'