woocommerce_webhook_topic_hooks filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_webhook_topic_hooks', 'filter_function_name_2674', 10, 2 );
function filter_function_name_2674( $topic_hooks, $that ){
	// filter...

	return $topic_hooks;
}

$topic_hooks

-

$that

-

Where the hook is called

$topic_hooks = apply_filters( 'woocommerce_webhook_topic_hooks', $topic_hooks, $this );

Where in WP core the hook is used WooCommerce