> ## 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.

# Amplitude

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

Linkrunner integrates with Amplitude 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 Amplitude 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 Amplitude, 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.  |
| Amplitude account  | An Amplitude 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="Create API Key in Amplitude and Configure in Linkrunner">
    First, you need to get your API key from your Amplitude dashboard.

    1. In your Amplitude dashboard, navigate to **Settings** > **Projects** > **API Keys**

    2. Copy your **API Key**

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

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

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

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

    <Info>
      **Important:** If you are using the `identify` function of the Amplitude 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 Amplitude identify)
            // ...other user fields
            amplitudeDeviceId = "AMPLITUDE_DEVICE_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 Amplitude identify)
            // ...other user fields
            amplitudeDeviceId: "AMPLITUDE_DEVICE_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 Amplitude identify)
                // ...other user fields
                amplitude_device_id: "AMPLITUDE_DEVICE_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 Amplitude identify)
            // ...other user fields
            amplitudeDeviceId: 'AMPLITUDE_DEVICE_ID', // Required if not using identify
          ),
          data: {},
        );
        ```
      </Tab>
    </Tabs>

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

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

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

    To sync, click the **Sync with Amplitude** 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 Amplitude:

1. Navigate to a user profile in the Amplitude dashboard
2. Look for the user 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