# Linking MailerLite as a source - Docs

**Alpha release**

This source is currently in **alpha**. The interface and available tables may change.

The MailerLite connector pulls your MailerLite email marketing data into the PostHog data warehouse.

## Adding a data source

1.  Go to the [sources tab](https://app.posthog.com/data-management/sources) of the data pipeline section in PostHog.
2.  Click **\+ New source** and then click **Link** next to MailerLite.
3.  You need a MailerLite API key, which you can create in your [MailerLite integrations settings](https://dashboard.mailerlite.com/integrations/api).
4.  Back in PostHog, enter the key in the `API key` field and click **Next**.
5.  Select the tables you want to sync, set the sync method and frequency, then click **Import**.

Once the syncs are complete, you can start using MailerLite data in PostHog.

## Available tables

| Table | Description | Sync method |
| --- | --- | --- |
| subscribers | Subscribers in your account | Full refresh |
| campaigns | Email campaigns | Full refresh |
| groups | Subscriber groups | Full refresh |
| segments | Subscriber segments | Full refresh |
| fields | Custom subscriber field definitions | Full refresh |
| automations | Automation workflows | Full refresh |
| forms_popup | Pop-up forms | Full refresh |
| forms_embedded | Embedded forms | Full refresh |
| forms_promotion | Promotion forms | Full refresh |
| webhooks | Configured webhooks | Full refresh |

**Incremental** tables sync only new or updated records on each run. **Full refresh** tables reload all data on each sync.

## Sync limitations

The MailerLite API exposes no server-side timestamp filter on any list endpoint, so every table is full-refresh only.

## Configuration

| Option | Type | Required |
| --- | --- | --- |
| API key | password | Yes |

## Supported tables

| Table | Description | Sync method | Incremental field | Primary key |
| --- | --- | --- | --- | --- |
| subscribers | A subscriber (contact) in the MailerLite account, including status and custom fields. | Full refresh | — | — |
| campaigns | An email campaign in MailerLite, including its type, status, and delivery settings. | Full refresh | — | — |
| groups | A group (segment-like collection) of subscribers in MailerLite. | Full refresh | — | — |
| segments | A dynamic segment of subscribers in MailerLite defined by filter conditions. | Full refresh | — | — |
| fields | A custom field definition used to store extra data on subscribers. | Full refresh | — | — |
| automations | An automation (workflow) in MailerLite that triggers emails based on subscriber events. | Full refresh | — | — |
| forms_popup | A pop-up subscription form in MailerLite used to capture new subscribers. | Full refresh | — | — |
| forms_embedded | An embedded subscription form in MailerLite used to capture new subscribers. | Full refresh | — | — |
| forms_promotion | A promotion form in MailerLite used to display promotional content to visitors. | Full refresh | — | — |
| webhooks | A webhook subscription in MailerLite that delivers event notifications to an external URL. | Full refresh | — | — |

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