EEC- GA4 - purchase without products

window.dataLayer = window.dataLayer || [];
window.dataLayer.push({
  event: 'purchase',            // name of the event. In this case, it always must be purchase
brand: 'EGO',            //name of brand for which XPay has been loaded
  ecommerce: {
    currency: 'PKR',
    value: 29.98,                       // order total (price of all products + shipping)
    tax: 3.00,                          // tax
    shipping: 5.00,                 // shipping costs
    transaction_id: 'abc123',           // transaction id


  }
});