woocommerce_order_item_product filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_order_item_product', 'filter_function_name_3378', 10, 2 );
function filter_function_name_3378( $product, $that ){
	// filter...

	return $product;
}

$product

-

$that

-

Where the hook is called

return apply_filters( 'woocommerce_order_item_product', $product, $this );

Where in WP core the hook is used WooCommerce