woocommerce_checkout_before_order_review_heading action-hook . WC 1.0

Usage

add_action( 'woocommerce_checkout_before_order_review_heading', 'action_function_name_9003' );
function action_function_name_9003(){
	// action...
}

Where the hook is called

<?php do_action( 'woocommerce_checkout_before_order_review_heading' ); ?>

Where in WP core the hook is used WooCommerce