WordPress at a glance
action is not described

woocommerce_helper_denied action-hook . WC 1.0

Fires when the Helper connection process is denied/cancelled.

Usage

add_action( 'woocommerce_helper_denied', 'action_function_name_2128' );
function action_function_name_2128(){
	// action...
}

Where the hook is called

WC_Helper::_helper_auth_return()
woocommerce_helper_denied
woocommerce/includes/admin/helper/class-wc-helper.php 737
do_action( 'woocommerce_helper_denied' );

Where in WP core the hook is used WooCommerce

woocommerce/includes/tracks/events/class-wc-extensions-tracking.php 20
add_action( 'woocommerce_helper_denied', array( $this, 'track_helper_connection_cancelled' ) );