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

# Migrating to 4.x.x

This migration is required only for people who have integrated plugin version 3.2.0 or below. If your plugin version is greater than 3.2.0 you can ignore this step.

# Removing existing plugin

Remove MoEngage SDK Plugin

<CodeGroup>
  ```javascript JavaScript theme={"theme":{"light":"github-light","dark":"github-dark"}}
  cordova plugin remove moengagesdk
  ```
</CodeGroup>

Remove MoEngage Push Extension, if added. Use the command `cordova plugin list` to check whether the plugin is installed or not.

<CodeGroup>
  ```javascript JavaScript theme={"theme":{"light":"github-light","dark":"github-dark"}}
  cordova plugin remove moengagepushextension
  ```
</CodeGroup>

# Install the new plugin

Install the new MoEngage SDK plugin.

<CodeGroup>
  ```javascript JavaScript theme={"theme":{"light":"github-light","dark":"github-dark"}}
  cordova plugin add moengagesdk --variable APP_ID="[your_Workspace_id]"
  ```
</CodeGroup>

### Variables

* **APP\_ID** = Workspace ID found under the settings page on the MoEngage dashboard.

# Initialize SDK(only for Android)

To initialize SDK create a class extending `Application` the class of Android and override `onCreate()`.\
Inside the `onCreate()` initialize the SDK as shown below.

<CodeGroup>
  ```javascript JavaScript theme={"theme":{"light":"github-light","dark":"github-dark"}}
  // this is the instance of the application class and "XXXXXXXXXXX" is the Workspace ID from the dashboard.
  MoEngage moEngage =
          new MoEngage.Builder(this, "XXXXXXXXXXX")
    			.build();
      MoEngage.initialise(moEngage);
  ```
</CodeGroup>

Make sure your application class is defined in the `AndroidManifest.xml` file as well.

# Setting up Push Notification(only Android)

MoEngage SDK supports both FCM and GCM, based on what you are using in your application install the appropriate plugin.\
The SDK no longer ships with Google's GCM or FCM library please ensure you have added the appropriate dependency in your app.

## FCM

<CodeGroup>
  ```javascript JavaScript theme={"theme":{"light":"github-light","dark":"github-dark"}}
  cordova plugin add cordova-moengage-fcm-dependency
  ```
</CodeGroup>

## GCM

<CodeGroup>
  ```javascript JavaScript theme={"theme":{"light":"github-light","dark":"github-dark"}}
  cordova plugin add cordova-moengage-gcm-dependency
  ```
</CodeGroup>

If MoEngage SDK is registering for push notification add the appropriate FCM/GCM listeners.

## FCM

<CodeGroup>
  ```javascript JavaScript theme={"theme":{"light":"github-light","dark":"github-dark"}}
  cordova plugin add cordova-moengage-fcm-listeners
  ```
</CodeGroup>

## GCM

<CodeGroup>
  ```javascript JavaScript theme={"theme":{"light":"github-light","dark":"github-dark"}}
  cordova plugin add cordova-moengage-gcm-listeners
  ```
</CodeGroup>

# Adding Push Related Meta Data

Refer to [Push Notification](/developer-guide/android-sdk/push/basic/push-configuration) documentation and add all the required meta-data for push notifications to work.