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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:
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); }