WooCommerce Payment Gateway actions after successful order.

gistfile1.php

<?php
                                        // Add a note to the order.  Put return code here if needed.
                                        $order->add_order_note( __('Payment completed', 'woocommerce')  );
                                        
                                        // Mark the order as complete
                                        $order->payment_complete();
                                        
                                        // Empty the cart
                                        $woocommerce->cart->empty_cart();

                                        // Empty awaiting payment session
                                        unset( $woocommerce->session->order_awaiting_payment );

                                        // Return thank you redirect
                                        return array(
                                                'result'         => 'success',
                                                'redirect'        => $this->get_return_url( $order ) 
                                        );