Soda GA direct revenue example.

(function () {
  function pushCustomGAEvent(eventType, eventElementType, elementId) {
    if (window.preDataLayer) {
      window.preDataLayer.push({
        event: "newEvent",
        newEventData: {
          type: eventType,
          elementType: eventElementType,
          elementId: elementId
        }
      });
    }
  }
  function pushImpretionEvent() {
    window.preDataLayer.push({
      event: "newEvent",
      newEventData: {
        ecommerce: {
          impressions: {
            "Adoric - Upsale: NEW gass in the cart": [
              {
                id: PRODUCT_SKU,
                title: "Spare Cylinder",
                type: "Carbonator",
                price: 2999,
                available: true,
                variants: [
                  {
                    id: PDRODUCT_ID,
                    name: "Spare Cylinder",
                    price: 2999,
                    available: true,
                    productId: PRODUCT_SKU
                  }
                ]
              }
            ]
          }
        },
        type: "ecommerceData"
      }
    });
  }
  function pushAddToCartEvent() {
    window.preDataLayer = window.dataLayer || [];
    window.preDataLayer.push({
      event: "newEvent",
      newEventData: {
        ecommerce: {
          add: {
            list: "Adoric - Upsale: NEW gass in the cart",
            products: [{ variant_id: PDRODUCT_ID, quantity: 1 }]
          }
        },
        type: "ecommerceData"
      }
    });
  }
  var GA_EVENT_CATEGORY = "Adoric - GASINTHECART";
  var GA_EVENT_ACTION = "Added to the cart";
  var GA_EVENT_LABEL = "Carbonating Cylinder ";
  var PDRODUCT_ID = 39539279659050;
  var PRODUCT_SKU = 6615783702570;
  pushImpretionEvent();
  function adoricAddToCart(productId) {
    var data = { id: productId, quantity: 1 };
    var xhr = new XMLHttpRequest();
    xhr.withCredentials = true;
    xhr.addEventListener("readystatechange", function () {
      if (this.readyState === 4) {
        console.log(this.responseText);
        pushCustomGAEvent(GA_EVENT_CATEGORY, GA_EVENT_ACTION, GA_EVENT_LABEL);
        pushAddToCartEvent();
        /*window.location.reload();*/
      }
    });
    xhr.open("POST", window.location.origin + "/cart/add.js");
    xhr.setRequestHeader("content-type", "application/json");
    xhr.setRequestHeader("cache-control", "no-cache");
    xhr.send(JSON.stringify(data));
  }
  adoricAddToCart(PDRODUCT_ID);
})();