woocomerce conditional thank you behavior based on product SKU.php

<?php

function order_items_include_tracking_pixel($order) {
  foreach ( $order->get_items() as $item ) {
    $product = $order->get_product_from_item( $item );
    if ( ! $product ) { continue; }
    $sku = $product->get_sku();
    if (preg_match('/-tp$/', $sku) === 1) {
      return true;
    }
  }
  return false;
}

function my_custom_tracking( $order_id ) {
  $order = new WC_Order( $order_id );

  if (order_items_include_tracking_pixel($order)) {
    $total = $order->get_order_total();
    
    // DO YOUR CUSTOM BEHAVIOR HERE
  }  
} 

add_action( 'woocommerce_thankyou', 'my_custom_tracking' );

?>