The TracerKit data layer

<script>
  window.tracerkitLayer = window.tracerkitLayer || [];
</script>

• window.tracerkitLayer is a plain array with GTM-dataLayer-compatible push semantics. Initialize it with window.tracerkitLayer = window.tracerkitLayer || [] — order relative to the TracerKit snippet doesn't matter: pushes made before the loader boots are drained on boot; later pushes are processed as they happen.
• Push events at the moment they happen, on the page where they happen. In SPAs, push after the route settles.
• Numbers are JSON numbers. "129.97", "$129.97", and "1.299,97" are all invalid — value and price are decimals, quantity is an integer.
• currency is an uppercase ISO 4217 code and is required whenever value is present.
• Push purchase exactly once per order. TracerKit dedupes on order_id, but ad platforms are less forgiving — don't re-push on confirmation-page reloads.
• Unknown extra fields are ignored, so you can share one push with an existing GTM dataLayer implementation.

type Item = {
  id: string;       // SKU or product ID — stable across events
  name: string;
  price: number;    // unit price, decimal
  quantity: number; // integer ≥ 1
};

<script>
  window.tracerkitLayer = window.tracerkitLayer || [];
  window.tracerkitLayer.push({
    event: "page_view"
  });
</script>

<script>
  window.tracerkitLayer = window.tracerkitLayer || [];
  window.tracerkitLayer.push({
    event: "view_item",
    value: 39.99,
    currency: "USD",
    items: [{ id: "SKU-123", name: "Canvas Tote", price: 39.99, quantity: 1 }]
  });
</script>

<script>
  window.tracerkitLayer = window.tracerkitLayer || [];
  window.tracerkitLayer.push({
    event: "add_to_cart",
    value: 79.98,
    currency: "USD",
    items: [{ id: "SKU-123", name: "Canvas Tote", price: 39.99, quantity: 2 }]
  });
</script>

<script>
  window.tracerkitLayer = window.tracerkitLayer || [];
  window.tracerkitLayer.push({
    event: "begin_checkout",
    value: 129.97,
    currency: "USD",
    items: [
      { id: "SKU-123", name: "Canvas Tote", price: 39.99, quantity: 2 },
      { id: "SKU-456", name: "Wool Beanie", price: 49.99, quantity: 1 }
    ]
  });
</script>

<script>
  window.tracerkitLayer = window.tracerkitLayer || [];
  window.tracerkitLayer.push({
    event: "purchase",
    order_id: "1001",
    value: 129.97,
    currency: "USD",
    items: [
      { id: "SKU-123", name: "Canvas Tote", price: 39.99, quantity: 2 },
      { id: "SKU-456", name: "Wool Beanie", price: 49.99, quantity: 1 }
    ],
    email: "jane@example.com",  // optional — hashed in-browser
    phone: "+15551234567"       // optional — hashed in-browser
  });
</script>