Has anyone integrated Zendesk with Flutter ?

override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
  super.configureFlutterEngine(flutterEngine)
  MethodChannel(flutterEngine.dartExecutor.binaryMessenger, "br.com.flowing/channels").setMethodCallHandler {
    call, result ->
      if (call.method == "openZenDeskSupport") {
          openZenDeskSupport()
          result.success(null)
      } else{
          result.notImplemented()      
      }
}}

private fun initZenDesk() {
  Zendesk.INSTANCE.init(this, {URL},
    {ID},
    {CLIENT_ID})
//if you need to share the user and email you will need to change this line below
  val identity: Identity = AnonymousIdentity()
  Zendesk.INSTANCE.setIdentity(identity)
  
  Support.INSTANCE.init(Zendesk.INSTANCE)

}

private fun openZenDeskSupport() {
    try {
      RequestActivity.builder().show(context)
    }catch (e: Exception){
        Log.e("Erro",e.toString())
    }
}

<activity
    android:name=".{nameApp}.MainActivity"
    android:exported="true"
    android:launchMode="singleTop"
    android:theme="@style/LaunchTheme"
    android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
    android:hardwareAccelerated="true"
    android:windowSoftInputMode="adjustResize">
    <!-- Specifies an Android theme to apply to this Activity as soon as
         the Android process has started. This theme is visible to the user
         while the Flutter UI initializes. After that, this theme continues
         to determine the Window background behind the Flutter UI. -->
    <meta-data
      android:name="io.flutter.embedding.android.NormalTheme"
      android:resource="@style/NormalTheme"
      />
    <intent-filter>
        <action android:name="android.intent.action.MAIN"/>
        <category android:name="android.intent.category.LAUNCHER"/>
    </intent-filter>
</activity>

Thanks, I've implemented all the things you just suggested. But I'm still getting the error. 

android:name=".{nameApp}.MainActivity"

Hello Tej Bikram Karki Can you tell me how did you start implementing this Flutter SKD , how much time did it take from you and so on ,thanks in advance