Added order tracking for Google Analytics 4 (#3092)

Author: fballiano

app/code/core/Mage/GoogleAnalytics/Block/Ga.php

@@ -129,7 +129,9 @@ protected function _getOrdersTrackingCode()
     {
         /** @var Mage_GoogleAnalytics_Helper_Data $helper */
         $helper = $this->helper('googleanalytics');
-        if ($helper->isUseUniversalAnalytics()) {
+        if ($helper->isUseAnalytics4()) {
+            return $this->_getOrdersTrackingCodeAnalytics4();
+        } elseif ($helper->isUseUniversalAnalytics()) {
             return $this->_getOrdersTrackingCodeUniversal();
         }
 
@@ -190,6 +192,46 @@ protected function _getOrdersTrackingCodeUniversal()
         return implode("\n", $result);
     }
 
+    /**
+     * @return string
+     * @throws Mage_Core_Model_Store_Exception
+     */
+    protected function _getOrdersTrackingCodeAnalytics4()
+    {
+        $orderIds = $this->getOrderIds();
+        if (empty($orderIds) || !is_array($orderIds)) {
+            return '';
+        }
+        $collection = Mage::getResourceModel('sales/order_collection')
+            ->addFieldToFilter('entity_id', ['in' => $orderIds]);
+        $result = [];
+        /** @var Mage_Sales_Model_Order $order */
+        foreach ($collection as $order) {
+            $orderData = [
+                'currency' => $order->getBaseCurrencyCode(),
+                'transaction_id' => $order->getIncrementId(),
+                'value' => number_format($order->getBaseGrandTotal(), 2),
+                'coupon' => strtoupper($order->getCouponCode()),
+                'shipping' => number_format($order->getBaseShippingAmount(), 2),
+                'tax' => number_format($order->getBaseTaxAmount(), 2),
+                'items' => []
+            ];
+
+            /** @var Mage_Sales_Model_Order_Item $item */
+            foreach ($order->getAllVisibleItems() as $item) {
+                $orderData['items'][] = [
+                    'item_id' => $item->getSku(),
+                    'item_name' => $item->getName(),
+                    'quantity' => $item->getQtyOrdered(),
+                    'price' => $item->getBasePrice(),
+                    'discount' => $item->getBaseDiscountAmount()
+                ];
+            }
+            $result[] = "gtag('event', 'purchase', " . json_encode($orderData, JSON_THROW_ON_ERROR) . ");";
+        }
+        return implode("\n", $result);
+    }
+
     /**
      * Render information about specified orders and their items
      *

app/design/frontend/base/default/template/googleanalytics/ga.phtml

@@ -26,6 +26,7 @@ $_accountId = $_helper->getAccountId();
             function gtag(){dataLayer.push(arguments);}
             gtag('js', new Date());
             gtag('config', '<?= $_accountId ?>');
+            <?php echo $this->_getOrdersTrackingCodeAnalytics4() ?>
         </script>
         <!-- END GOOGLE ANALYTICS 4 CODE -->
     <?php elseif ($_helper->isUseUniversalAnalytics()): ?>