Meta Pixel fbq('track', 'InitiateCheckout') in Additional Scripts

analytics.subscribe('checkout_started', (event) => {
  const { checkout } = event.data;
  if (!checkout) return;

  const value = checkout.totalPrice ? checkout.totalPrice.amount : undefined;
  const currency = checkout.totalPrice ? checkout.totalPrice.currencyCode : undefined;
  const numItems = checkout.lineItems.reduce((sum, item) => sum + item.quantity, 0);

  fetch(`https://graph.facebook.com/v20.0/PIXEL_ID/events?access_token=ACCESS_TOKEN`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    keepalive: true,
    body: JSON.stringify({
      data: [{
        event_name: 'InitiateCheckout',
        event_time: Math.floor(Date.now() / 1000),
        event_id: checkout.token,
        action_source: 'website',
        custom_data: { value, currency, num_items: numItems },
      }],
    }),
  });
});

Legacy pattern detected via: fbq\(\s*['"]track['"]\s*,\s*['"]InitiateCheckout['"]