When does Klaviyo create a profile?

Hi,

I’m trying to develop a Wordpress script that adds a language custom property to a user depending if the website it’s showing in English, Spanish or Portuguese.

I know that from the first moment a user is visiting a website Klaviyo retrieves it’s data and prepares the data model until user gives his email. My question is, in which moment can I add a custom property to the user? For the moment I’ve developed it like when the user clicks on PLACE ORDER (assuming email has been introduced) then I add ‘language’ property to the user. 
But the question is? I could do it before? How could I get the current user that’s surfing my website?

Here’s a piece of the code I’m developing:


 

function setKlaviyoLanguage() {

  // Get the current user's email
  global $current_user;
  get_currentuserinfo();
  $email = $current_user->user_email; // ???

  // Check if the user exists in Klaviyo
  $api_key = 'API_KEY';
  $check_url = 'https://a.klaviyo.com/api/v2/customer/' . $email . '/exists?api_key=' . $api_key;
  $check_result = file_get_contents($check_url);
  $check_result = json_decode($check_result, true);

  if ($check_result['exists']) {
    // Get the current URI
    $current_uri = $_SERVER['REQUEST_URI'];

    // Check if the URI contains /en/
    if (strpos($current_uri, '/en/') !== false) {
      $language = 'en';
    }
    // Check if the URI contains /pt-br/
    elseif (strpos($current_uri, '/pt-br/') !== false) {
      $language = 'pt-br';
    }
    // If neither /en/ or /pt-br/ is present, set language to 'es'
    else {
      $language = 'es';
    }

    // Connect to Klaviyo API
    $data = array(
      'api_key' => $api_key,
      'email' => $email,
      'properties' => array(
        'lan' => $language
      )
    );
    $url = 'https://a.klaviyo.com/api/v2/customer/';

    $options = array(
      'http' => array(
        'header'  => "Content-type: application/x-www-form-urlencoded\r\n",
        'method'  => 'POST',
        'content' => http_build_query($data)
      )
    );
    $context  = stream_context_create($options);
    $result = file_get_contents($url, false, $context);
  }
}


Red text it’s where I am assuming  that I’ll get the user in base of the mail introduced at checkout fields by the user.

Hope to hear from you, Klaviyo Support Team :)