woocommerce_admin_order_item_headers │ action-hook │ WC 1.0

Usage

add_action( 'woocommerce_admin_order_item_headers', 'wp_kama_woocommerce_admin_order_item_headers_action' );

/**
 * Function for `woocommerce_admin_order_item_headers` action-hook.
 * 
 * @param  $order 
 *
 * @return void
 */
function wp_kama_woocommerce_admin_order_item_headers_action( $order ){

	// action...
}

$order

-

Where the hook is called

<?php do_action( 'woocommerce_admin_order_item_headers', $order ); ?>

Where the hook is used in WooCommerce