woocommerce_google_analytics_placed_order.php

<?php
/**
 * Send an event to GA whenever a user is about to initiate payment.
 *
 * The event is fired not just after the user clicks on the "Place Order"
 * button, but when WooCommerce is actually going to redirect the user
 * to the Payment Gateway, using the woocommerce_checkout_order_processed
 * action.
 * 
 * Furthermore, additional information is passed with the event:
 * - The order ID as the event label, in the format order_id_<ID>.
 * - The order's total price as the event value.
 *
 * Requires the plugin 'WooCommerce Google Analytics Pro' by SkyVerge.
 * With respect to the standard 'placed order' event from the plugin,
 * the event sent by this function includes the order's value.
 *
 * Linked to the woocommerce_checkout_order_processed action.
 *
 * You can find the latest version of this snippet at:
 * https://gist.github.com/coccoinomane/9bce191924692bbe7b6a1c59513ccb7a
 */
function omai_send_placed_order_event( $order_id ) {

  /* Will be the event action in GA */
  $eventName = "placed_order_custom";

  /* Event value will be the price of the cart items; no shipping, no discount */
  $eventValue = wc_get_order( $order_id )->get_total();

  /* Event details; for more information, see the track_event() function in
  class-wc-google-analytics-pro-measurement-protocol-api-request.php */
  $properties = array(
    'eventCategory'     => "Checkout",
    'eventLabel'        => "order_id_" . $order_id,
    'eventValue'        => $eventValue,
    'checkoutStep'      => null,
  );

  // error_log( "About to send '$eventName' event" );
  // error_log( "Event value = " . $eventValue );

  /* Send the event to GA using the measurement protocol */
  wc_google_analytics_pro()->get_integration()->custom_event( $eventName, $properties );

  // error_log( "Event sent" );

}