Product page - when a product is viewed

window.dataLayer = window.dataLayer || [];
window.dataLayer.push({
  event: 'view_item',           // name of the event. In this case, it always must be view_item
  ecommerce: {
    items: [{                           // an array with a product
      item_name: 'Product 1',           // insert an actual product name
      item_id: 'product1',              // insert an actual product ID
      price: '11.99',                   // insert an actual product price. Number or a string. Don't include currency code
      item_brand: 'brand A',            // insert an actual product price
      item_category: 'Apparel',         // insert an actual product top-level category
      item_category2: 'T-shirt',        // if it is possible to drill down the categories (e.g. Apparel, then T-shirt, then Men), use item_category2, item_category3, etc. Can use from item_category up to item_category5
      item_variant: 'Blue',             // insert an actual product variant
      quantity: '1'                     // product quantity. In this case, it will usually be equal to 1
    }]
  }
});