Alan

utm_source   = plateforme (google, linkedin, facebook, email, partner)
utm_medium   = type de canal (cpc, social-paid, social-organic, email, referral, content)
utm_campaign = nom de campagne (format: YYYY-MM_nom-campagne)
utm_content  = variante creative (cta-header, banner-v2, carousel-3)
utm_term     = mot-cle ou audience (decision-makers, rh-pme, assurance-sante)

Exemple complet :
?utm_source=linkedin
&utm_medium=social-paid
&utm_campaign=2026-03_assurance-pme
&utm_content=carousel-temoignage
&utm_term=drh-50-200

// Capture UTM params from URL and store in cookies
(function() {
  var params = new URLSearchParams(window.location.search);
  var utmKeys = ['utm_source','utm_medium','utm_campaign',
                 'utm_content','utm_term'];
  utmKeys.forEach(function(key) {
    var val = params.get(key);
    if (val) {
      document.cookie = key + '=' + val +
        ';path=/;max-age=2592000'; // 30 days
    }
  });
})();

// Inject UTM values into HubSpot form hidden fields
window.addEventListener('message', function(e) {
  if (e.data.type === 'hsFormCallback' &&
      e.data.eventName === 'onFormReady') {
    ['utm_source','utm_medium','utm_campaign',
     'utm_content','utm_term'].forEach(function(key) {
      var val = getCookie(key);
      if (val) {
        var input = document.querySelector(
          'input[name="' + key + '"]');
        if (input) input.value = val;
      }
    });
  }
});