TikTok Events API server-side integration (ttclid capture dependency)

// This pattern covers stores where server-side TikTok Events API is already
// correctly wired, but ttclid (TikTok click ID, needed for click-attribution
// matching) was captured into a cookie by a script injected in
// checkout.liquid or Additional Scripts. That capture point dies Aug 26; the
// Events API server call itself is unaffected once ttclid keeps flowing.
analytics.subscribe('checkout_started', (event) => {
  // Read ttclid from the URL the customer arrived with, persisted earlier by
  // your ad-click landing page into a first-party cookie BEFORE checkout —
  // this subscription re-persists it at checkout start via the sandboxed
  // browser.cookie API so it survives through to your order-webhook-based
  // server-side Events API call.
  browser.cookie.get('ttclid').then((existing) => {
    if (existing) {
      browser.cookie.set('ttclid', existing);
    }
  });
});

Legacy pattern detected via: ttclid[\s\S]{0,80}checkout\.liquid|document\.cookie[\s\S]{0,40}ttclid