GA UA Checkout Option

<script>
window.dataLayer = window.dataLayer || [];
window.dataLayer.push({
  event: 'checkoutOption',          // name of an event. In this case, always stays as checkoutOption
  ecommerce: {                          // ecommerce object. This is the essential part of tracking. New EE data must always be pushed to this object
    checkout_option: {                  // name of an action. In this case, always stays as checkout_option
      actionField: {
        step: step,                     // number of the checkout step in which a user chose an action for the delivery address - add, edit or delete
        option: 'add'               // payment option that a visitor has chosen (add, edit or delete)
      }
    }
  }
});
</script>