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# Subscribe to Lists

## `array subscribeToLists(string $subscriber_id, array $list_ids [, array $options = []])`

This method allows adding an existing subscriber into lists and handles confirmation email and admin notification email sending.

- *A confirmation email* is an email which is sent to a subscriber so they can confirm their subscription. It is sent only if sign-up confirmation is enabled in MailPoet settings and subscriber has not received any confirmation email yet.
- *A welcome email* is an automatic email which is sent to a new subscriber. This email is scheduled only if sign-up confirmation is disabled and some welcome email is configured for some of given lists.
- *An admin notification email* is sent to the site admin to inform them about a new subscription. It is sent only if the notification feature is enabled in the MailPoet setting.

All these emails can be disabled using `$options`.

It returns a subscriber. See [Get Subscriber](GetSubscriber.md) for a subscriber data structure.

## Arguments
### string `$subscriber_id` (required)
An id or an email address. An `\Exception` is thrown when the value doesn't match any subscriber.

### array `$list_ids` (required)
An array of list ids. An `\Exception` is thrown if any of list ids are invalid. In such a case the subscriber isn't added to any list.

### array `$options` (optional)
All options are optional. If omitted, a default value is used.

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| send_confirmation_email | boolean | true | Can be used to disable confirmation email. Otherwise, a confirmation email is sent as described above.|
| schedule_welcome_email | boolean | true | Can be used to disable welcome email. Otherwise, a welcome email is scheduled as described above.|
| skip_subscriber_notification | boolean | false | Can be used to disable an admin notification email. Otherwise, an admin notification email is sent as described above.|

## Error handling

All expected errors from the API are exceptions of class `\MailPoet\API\MP\v1\APIException`. 
Code of the exception is populated to distinguish between different errors.

An exception of base class `\Exception` can be thrown when something unexpected happens.

Codes description:

| Code | Description |
| --- | ---  |
| 3 | No lists provided |
| 4 | Invalid subscriber that does not exist |
| 5 | Invalid list that does not exist |
| 6 | Trying to subscribe to a WordPress Users list |
| 7 | Trying to subscribe to a WooCommerce Customers list |
| 8 | Trying to subscribe to a list that doesn’t support that |
| 10 | Confirmation email failed to send |
| 17 | Welcome email failed to send |