(function() { // Safety check: Avoid triggering the purchase event more than once if (sessionStorage.getItem('purchaseTriggered')) { return; } // A function to get URL parameters function getUrlParameter(name) { name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]'); var regex = new RegExp('[\\?&]' + name + '=([^&#]*)'); var results = regex.exec(location.search); return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' ')); } // Get e-commerce parameters from the URL var ecommerceData = { 'transaction_id': getUrlParameter('tx_id'), 'value': parseFloat(getUrlParameter('order_value')), 'currency': getUrlParameter('currency'), 'items': [{ 'item_id': getUrlParameter('product_id'), 'item_name': getUrlParameter('product_name'), 'quantity': parseInt(getUrlParameter('quantity')), 'price': parseFloat(getUrlParameter('order_value')) / parseInt(getUrlParameter('quantity')), 'item_variant': '', 'item_brand': '', 'item_category': '', 'sku': getUrlParameter('sku') }], 'tax': parseFloat(getUrlParameter('tax')), 'shipping': parseFloat(getUrlParameter('shipping')) }; // Push the e-commerce data to the data layer window.dataLayer = window.dataLayer || []; window.dataLayer.push({ 'event': 'purchase', 'ecommerce': ecommerceData }); // Mark the purchase event as triggered sessionStorage.setItem('purchaseTriggered', 'true'); })();