WordPress at a glance
action is not described

woocommerce_shipping_method_chosen action-hook . WC 1.0

Usage

add_action( 'woocommerce_shipping_method_chosen', 'action_function_name_2543' );
function action_function_name_2543( $chosen_method ){
	// action...
}
$chosen_method
-

Where the hook is called

wc_get_chosen_shipping_method_for_package()
woocommerce_shipping_method_chosen
woocommerce/includes/wc-cart-functions.php 424
do_action( 'woocommerce_shipping_method_chosen', $chosen_method );

Where the hook is used (in WC core)

Usage not found!