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
woocommerce_checkout_before_order_review_heading
woocommerce/templates/checkout/form-checkout.php 52
<?php do_action( 'woocommerce_checkout_before_order_review_heading' ); ?>