[back to list](../Readme.md) # Subscribe to List ## `array subscribeToList(string $subscriber_id, string $list_id [, array $options = []])` This method allows adding an existing subscriber into a list, and handles confirmation email and admin notification email sending. This method works exactly the same as [Subscribe to lists](SubscribeToLists.md). The only difference is the second argument which is a single list id.