add_action( 'woocommerce_thankyou', 'pfwp_redirect_woo_checkout');
function pfwp_redirect_woo_checkout( $order_id ){
    $order = wc_get_order( $order_id );
    $url = 'https://coachzul.com/th4nxs/';
    if ( ! $order->has_status( 'failed' ) ) {
        wp_safe_redirect( $url );
        exit;
    }
}