woocommerce_view_order │ action-hook │ WC 1.0

Usage

add_action( 'woocommerce_view_order', 'wp_kama_woocommerce_view_order_action' );

/**
 * Function for `woocommerce_view_order` action-hook.
 * 
 * @param  $order_id 
 *
 * @return void
 */
function wp_kama_woocommerce_view_order_action( $order_id ){

	// action...
}

$order_id

-

Where the hook is called

<?php do_action( 'woocommerce_view_order', $order->get_id() ); ?>

<?php do_action( 'woocommerce_view_order', $order_id ); ?>

Where the hook is used in WooCommerce

add_action( 'woocommerce_view_order', 'woocommerce_order_details_table', 10 );