> ## Documentation Index
> Fetch the complete documentation index at: https://docs.linkrunner.io/llms.txt
> Use this file to discover all available pages before exploring further.

# PostHog

> Connect Linkrunner with PostHog to import attribution data and understand your user acquisition campaigns

Linkrunner integrates with PostHog to automatically send attribution data, helping you understand which campaigns are driving user acquisition and engagement.

## How it works

Every time a user is attributed by Linkrunner, we automatically send a request to PostHog to update the corresponding user's profile with custom properties:

* `lr_campaign` - The campaign identifier
* `lr_ad_network` - The ad network source

### Example

* User ID `24` came from campaign link: `https://app.linkrunner.io/?c=AXb1c2`
* In PostHog, for user profile with ID `24`, you'll see `lr_campaign` set to `AXb1c2` and `lr_ad_network` set to an ad network source

## Prerequisites

| Requirement        | Description                                                              |
| ------------------ | ------------------------------------------------------------------------ |
| Linkrunner account | A Linkrunner account is required to take advantage of this integration.  |
| PostHog account    | A PostHog account with API access.                                       |
| iOS or Android app | This integration supports iOS and Android apps.                          |
| Linkrunner SDK     | You must have the [Linkrunner SDK](/introduction) installed in your app. |

## Steps to setup

<Steps>
  <Step title="Get API Key from PostHog and Configure in Linkrunner">
    First, you need to get your API key from your PostHog dashboard.

    1. In your PostHog dashboard, navigate to **Project Settings** > **Project API Key**

    2. Copy your **API Key**

    3. In Linkrunner, navigate to **Integrations** from the left-hand panel

    4. Under **Analytics**, click **Configure** for PostHog

    5. Enter your **API Key**
  </Step>

  <Step title="Map User Identifiers in SDK">
    To properly link users between Linkrunner and PostHog, you need to pass the correct identifier in the `signup` function.

    <Info>
      **Important:** If you are using the `identify` function of the PostHog SDK to set a user ID, pass the same user ID in the `userData` parameter of the Linkrunner `signup` function. If you are not using `identify`, pass the `distinct_id` or `device_id` instead.
    </Info>

    <Tabs>
      <Tab title="Android (Kotlin)">
        ```kotlin theme={null}
        import io.linkrunner.sdk.LinkRunner
        import io.linkrunner.sdk.models.request.UserDataRequest

        val userData = UserDataRequest(
            id = "123", // Your user ID (same as PostHog identify)
            // ...other user fields
            posthogDistinctId = "POSTHOG_DISTINCT_ID", // Required if not using identify
        )

        LinkRunner.getInstance().signup(userData = userData)
        ```
      </Tab>

      <Tab title="iOS (Swift)">
        ```swift theme={null}
        import Linkrunner

        let userData = UserData(
            id: "123", // Your user ID (same as PostHog identify)
            // ...other user fields
            posthogDistinctId: "POSTHOG_DISTINCT_ID" // Required if not using identify
        )

        try await LinkrunnerSDK.shared.signup(userData: userData)
        ```
      </Tab>

      <Tab title="React Native">
        ```javascript theme={null}
        import linkrunner from "rn-linkrunner";

        await linkrunner.signup({
            user_data: {
                id: "123", // Your user ID (same as PostHog identify)
                // ...other user fields
                posthog_distinct_id: "POSTHOG_DISTINCT_ID", // Required if not using identify
            },
            data: {},
        });
        ```
      </Tab>

      <Tab title="Flutter">
        ```dart theme={null}
        import 'package:linkrunner/main.dart';

        await LinkRunner().signup(
          userData: LRUserData(
            id: '123', // Your user ID (same as PostHog identify)
            // ...other user fields
            posthogDistinctId: 'POSTHOG_DISTINCT_ID', // Required if not using identify
          ),
          data: {},
        );
        ```
      </Tab>
    </Tabs>

    <Tip>
      You can get the `posthogDistinctId` from the PostHog SDK in your app.
    </Tip>
  </Step>

  <Step title="Sync with PostHog (Optional)">
    Use the **Sync** feature in the following scenarios:

    * First time after adding your PostHog API Key
    * If you see discrepancies in attribution data on PostHog profiles

    To sync, click the **Sync with PostHog** button in the Linkrunner integration settings. This process may take a while depending on the number of users.
  </Step>
</Steps>

## Viewing Attribution Data

After the integration is complete, you can view the attribution data in PostHog:

1. Navigate to a user profile in the PostHog dashboard
2. Look for the person properties section
3. You'll see `lr_campaign` and `lr_ad_network` attributes with the corresponding values

This data can be used to:

* Create cohorts based on acquisition source
* Personalize experiences based on campaign origin
* Analyze user behavior by acquisition channel