woocommerce_calculated_shipping action-hook . WC 1.0

Usage

add_action( 'woocommerce_calculated_shipping', 'action_function_name_3192' );
function action_function_name_3192(){
	// action...
}

Where the hook is called

do_action( 'woocommerce_calculated_shipping' );

Where in WP core the hook is used WooCommerce