NSDictionary* dict = request.content.userInfo;
NSString* custom = [dict objectForKey:@"custom"];
NSString* aps = [dict objectForKey:@"aps"];

NSLog(@"Running NotificationServiceExtension: custom = %@", custom);
NSLog(@"Running NotificationServiceExtension: aps = %@", aps);

let userInfo = request.content.userInfo

print("Running NotificationServiceExtension: userInfo = \(userInfo.description)")

import UserNotifications
import OneSignal
import os.log

class NotificationService: UNNotificationServiceExtension {
    
    var contentHandler: ((UNNotificationContent) -> Void)?
    var receivedRequest: UNNotificationRequest!
    var bestAttemptContent: UNMutableNotificationContent?
    
    override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
        self.receivedRequest = request;
        self.contentHandler = contentHandler
        bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)
        
        let userInfo = request.content.userInfo
        let custom = userInfo["custom"]
        print("Running NotificationServiceExtension: userInfo = \(userInfo.description)")
        print("Running NotificationServiceExtension: custom = \(custom.debugDescription)")
      //debug log types need to be enabled in Console > Action > Include Debug Messages
        os_log("%{public}@", log: OSLog(subsystem: "com.your.bundleid", category: "OneSignalNotificationServiceExtension"), type: OSLogType.debug, userInfo.debugDescription)
        

        
        if let bestAttemptContent = bestAttemptContent {
            OneSignal.didReceiveNotificationExtensionRequest(self.receivedRequest, with: self.bestAttemptContent)
            contentHandler(bestAttemptContent)
        }
    }
    
    override func serviceExtensionTimeWillExpire() {
        // Called just before the extension will be terminated by the system.
        // Use this as an opportunity to deliver your "best attempt" at modified content, otherwise the original push payload will be used.
        if let contentHandler = contentHandler, let bestAttemptContent =  bestAttemptContent {
            OneSignal.serviceExtensionTimeWillExpireRequest(self.receivedRequest, with: self.bestAttemptContent)
            contentHandler(bestAttemptContent)
        }
    }
    
}

#import <OneSignal/OneSignal.h>

#import "NotificationService.h"

@interface NotificationService ()

@property (nonatomic, strong) void (^contentHandler)(UNNotificationContent *contentToDeliver);
@property (nonatomic, strong) UNNotificationRequest *receivedRequest;
@property (nonatomic, strong) UNMutableNotificationContent *bestAttemptContent;

@end

@implementation NotificationService

- (void)didReceiveNotificationRequest:(UNNotificationRequest *)request withContentHandler:(void (^)(UNNotificationContent * _Nonnull))contentHandler {
    self.receivedRequest = request;
    self.contentHandler = contentHandler;
    self.bestAttemptContent = [request.content mutableCopy];
    
    [OneSignal didReceiveNotificationExtensionRequest:self.receivedRequest withMutableNotificationContent:self.bestAttemptContent];
    
    // DEBUGGING: Uncomment the 2 lines below and comment out the one above to ensure this extension is excuting
    //            Note, this extension only runs when mutable-content is set
    //            Setting an attachment or action buttons automatically adds this
    NSLog(@"Running NotificationServiceExtension");
    self.bestAttemptContent.body = [@"[Modified] " stringByAppendingString:self.bestAttemptContent.body];
    
  NSUserDefaults *userDefault = [[NSUserDefaults alloc] initWithSuiteName:@"group.com.onesignal.jonexample.onesignal"];
    NSLog(@"NSE player_id: %@", [userDefault  stringForKey:@"GT_PLAYER_ID"]);
    NSLog(@"NSE app_id: %@", [userDefault  stringForKey:@"GT_APP_ID"]);
    
    self.contentHandler(self.bestAttemptContent);
}

- (void)serviceExtensionTimeWillExpire {
    // Called just before the extension will be terminated by the system.
    // Use this as an opportunity to deliver your "best attempt" at modified content, otherwise the original push payload will be used.
    
    [OneSignal serviceExtensionTimeWillExpireRequest:self.receivedRequest withMutableNotificationContent:self.bestAttemptContent];
    
    self.contentHandler(self.bestAttemptContent);
}

@end

import android.support.v4.app.NotificationCompat;
import com.onesignal.OSNotificationDisplayedResult;
import com.onesignal.OSNotificationPayload;
import com.onesignal.NotificationExtenderService;
import com.onesignal.OSNotificationReceivedResult;
import java.math.BigInteger;
import android.util.Log;

public class NotificationServiceExtensionExample extends NotificationExtenderService {
   @Override
   protected boolean onNotificationProcessing(OSNotificationReceivedResult receivedResult) {
      OverrideSettings overrideSettings = new OverrideSettings();
      overrideSettings.extender = new NotificationCompat.Extender() {
         @Override
         public NotificationCompat.Builder extend(NotificationCompat.Builder builder) {
            //Force remove push from Notification Center after 30 seconds
            builder.setTimeoutAfter(30000);
            // Sets the icon accent color notification color to Green on Android 5.0+ devices.
            builder.setColor(new BigInteger("FF00FF00", 16).intValue());
            builder.setContentTitle("New Message");
            builder.setContentText("New Encrypted Message");
            return builder;
         }
      };

      OSNotificationDisplayedResult displayedResult = displayNotification(overrideSettings);
      Log.d("OneSignalExample", "Notification displayed with id: " + displayedResult.androidNotificationId);

      // Return true to stop the notification from displaying.
      return false;
   }
}

<service
   android:name=".YOUR_CLASS_NAME"//.NotificationExtenderExample in example below
   android:permission="android.permission.BIND_JOB_SERVICE"
   android:exported="false">
   <intent-filter>
      <action android:name="com.onesignal.NotificationExtender" />
   </intent-filter>
</service>

public class NotificationServiceExtensionExample extends NotificationServiceExtension {
   @Override
   protected boolean onNotificationProcessing(OSNotificationReceivedResult receivedResult) {
      OverrideSettings overrideSettings = new OverrideSettings();
      overrideSettings.extender = new NotificationCompat.Extender() {
         @Override
         public NotificationCompat.Builder extend(NotificationCompat.Builder builder) {
            if (!receivedResult.restoring) {
               // Only set custom channel if notification is not being restored
               // Note: this would override any channels set through the OneSignal dashboard
               return builder.setChannelId("News");
            }
         }
      };
     
      /* Do something with notification payload */
      String title = receivedResult.payload.title;
      String body  = receivedResult.payload.body;
      String additionalData = receivedResult.payload.additionalData;
     
      // Writes additionalData values to local database
      SQLiteDatabase db = dbHelper.getWritableDatabase();
      ContentValues values = new ContentValues();
      values.put(FeedEntry.COLUMN_NAME_ARTICLE_TITLE, additionalData.articleTitle);
      values.put(FeedEntry.COLUMN_NAME_ARTICLE_ID, additionalData.articleId);
      long newRowId = db.insert(FeedEntry.TABLE_NAME, null, values);
      // ...
     
      return true;
   }
}