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Integration Steps

1

Create Firebase project in firebase console

To start sending notifications from FCM, you’ll have to first create a firebase project. Create firebase project and application in firebase console with your applications package name which you can find in MainApplication.java or AndroidManifest.xml
2

Adding google-services.json

You can get your Service Account JSON by following these instructions. Download google-services.json and add the file inside your android>app folder.
3

Adding Firebase dependencies and plugins

Add below dependency inside projects build.gradle inside dependencies
dependencies {
        ...
        classpath 'com.google.gms:google-services:4.3.10' // or latest version
}
Add below plugin inside apps build.gradle
apply plugin: 'com.google.gms.google-services'
Add below dependency inside apps build.gradle inside dependencies
implementation("com.google.firebase:firebase-messaging:22.0.0") // or latest version
4

Implementing push

Push feature can be implemented in two ways:
Since your service is registered in the app manifest, to render the push notification directed from SuprSend server you will have to add the below code to your service.
console.log("Hello World");
5

Sending the FCM token to SuprSend

class YourApplication : Application() {

    override fun onCreate() {
    FirebaseMessaging.getInstance().token.addOnCompleteListener(OnCompleteListener { task ->
        if (!task.isSuccessful) {
            Log.w(TAG, "Fetching FCM registration token failed", task.exception)
            return@OnCompleteListener
        }
        val fcmToken = task.result
        suprsend.user.setAndroidFcmPush(fcmToken);
    })

    //or if you are on older FCM version

    val fcmToken  = FirebaseInstanceId.getInstance().token
    instance.getUser().setAndroidFcmPush(fcmToken)
}

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Asking for permission -Android 13(API-33)

import android.Manifest
import android.annotation.SuppressLint
import android.content.Intent
import android.net.Uri
import android.os.Build
import android.os.Bundle
import android.provider.Settings
import android.util.Log
import android.widget.Toast
import androidx.activity.result.contract.ActivityResultContracts
import androidx.appcompat.app.AlertDialog
import androidx.appcompat.app.AppCompatActivity
import androidx.viewpager.widget.ViewPager
import com.google.firebase.messaging.FirebaseMessaging
import org.json.JSONObject

class YourActivity : AppCompatActivity() {
    private val activityResultLauncher = registerForActivityResult(ActivityResultContracts.RequestPermission()) { isGranted: Boolean ->
        if (!isGranted) {
            // You can show a dialog which explains the intent of this permission request of how it is important for certain features of your app to work
            AlertDialog.Builder(this)
                .setView(R.layout.notification_permission_desc)
                .setTitle(getString(R.string.app_name))
                .setPositiveButton("Proceed") { _, _ ->
                    val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
                    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
                    val uri: Uri = Uri.fromParts("package", packageName, null)
                    intent.data = uri
                    startActivity(intent)
                }
                .setNegativeButton("Deny") { _, _ ->
                }.show()
        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
       super.onCreate(savedInstanceState)
       if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
            activityResultLauncher.launch(
                Manifest.permission.POST_NOTIFICATIONS
            )
        }
    }
}
If the androidx dependency is not present then you will have to add the below dependency in your app dependencies 
dependencies {
	implementation("androidx.appcompat:appcompat:1.3.1")
}
How to identify if notification is sent by SuprSend?If notification payload contains key supr_send_n_pl then simply consider this as payload sent from suprsend and pass the payload to suprsend SDK by:if (payload?.data?.supr_send_n_pl) { suprsend.showNotification(payload.data.supr_send_n_pl); }