How to send Apple push notification to specific users

I have managed to get push notifications working but I have trouble on how to send notifications to specific users. Perhaps using a customer number or name etc. I don’t know where to even start. I have spent weeks reading hundreds of web sites and I can’t seem to work it out.

These are just a few of the pages I’ve looked at:

Here is my objective-c code in Appdelegate – Sorry if it’s not great I have pieced it together from several posts.

        @implementation AppDelegate
- (void)userNotificationCenter:(UNUserNotificationCenter *)center
willPresentNotification:(UNNotification *)notification  withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler{
NSLog( @"for handling push in foreground" );
// Your code
NSLog(@"%@", notification.request.content.userInfo); //for getting response payload data
    completionHandler(UNNotificationPresentationOptionBadge | UNNotificationPresentationOptionBanner);
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    
    UNUserNotificationCenter.currentNotificationCenter.delegate= self;
    [self requestPushNotificationPermissions];
    NSLog(@"need this:01 @");
    return YES;
}

- (void)application:(UIApplication*)app didRegisterForRemoteNotificationsWithDeviceToken:(NSData*)devToken

{
    NSLog(@"need this Token:02 @");
    // parse token bytes to string
    const char *data = [devToken bytes];
    NSMutableString *token = [NSMutableString string];
    for (NSUInteger i = 0; i < [devToken length]; i++)
    {
        [token appendFormat:@"%02.2hhX", data[i]];
    }
    
    // print the token in the console.
    NSLog(@"Push Notification Token: %@", [token copy]);
}

- (void)requestPushNotificationPermissions
{
    // iOS 10+
    UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
    [center getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {
        
        switch (settings.authorizationStatus)
        {
            // User hasn't accepted or rejected permissions yet. This block shows the allow/deny dialog
            case UNAuthorizationStatusNotDetermined:
            {
                [[UNUserNotificationCenter currentNotificationCenter] requestAuthorizationWithOptions:(UNAuthorizationOptionBadge | UNAuthorizationOptionSound | UNAuthorizationOptionAlert) completionHandler:^(BOOL granted, NSError * _Nullable error) {
                  if (granted) {
                  dispatch_async(dispatch_get_main_queue(), ^{
                  [[UIApplication sharedApplication] registerForRemoteNotifications];
                  });
                  }
                }];
                
                center.delegate = self;
                [center requestAuthorizationWithOptions:(UNAuthorizationOptionSound | UNAuthorizationOptionAlert | UNAuthorizationOptionBadge) completionHandler:^(BOOL granted, NSError * _Nullable error)
                 {
                     if(granted)
                     {
                         dispatch_async(dispatch_get_main_queue(), ^{
                                 [[UIApplication sharedApplication] registerForRemoteNotifications];
                             });
                       //  [[UIApplication sharedApplication] registerForRemoteNotifications];
                     }
                     else
                     {
                         // notify user to enable push notification permission in settings
                     }
                 }];
                break;
            }
            // the user has denied the permission
            case UNAuthorizationStatusDenied:
            {
                // notify user to enable push notification permission in settings
                break;
            }
            // the user has accepted; Register a PN token
            case UNAuthorizationStatusAuthorized:
            {
                dispatch_async(dispatch_get_main_queue(), ^{
                        [[UIApplication sharedApplication] registerForRemoteNotifications];
                    });
                           
              //  [[UIApplication sharedApplication] registerForRemoteNotifications];
                break;
            }
            default:
                break;
        }
    }];
}

Here is the server side PHP code

         <?php

       $device_token = 
       "AB028BLAH8A2BLAHE0485BLAHEABLAHEDFAKED3EBLAHFF0AFDBBBLAHBLAHBLAH";
       //echo $key;
       $kid      = "6FAKEJFAKE";
       $teamId   = "FAKEZ2FAKE";
       $app_bundle_id = "com.name.appname";
       $base_url = "https://api.development.push.apple.com";

       $header = ["alg" => "ES256", "kid" => $kid];
       $header = base64_encode(json_encode($header));

       $claim = ["iss" => $teamId, "iat" => time()];
       $claim = base64_encode(json_encode($claim));

       $token = $header.".".$claim;
       // key in same folder as the script
       $filename = "AuthKey_6FAKEJFAKE.p8";
       $pkey     = openssl_pkey_get_private("file://{$filename}");
       $signature;
       openssl_sign($token, $signature, $pkey, 'sha256');
       $sign = base64_encode($signature);

       $jws = $token.".".$sign;

       $message = '{"aps":{"alert":"Push Test Message.","sound":"default"}}';

       function sendHTTP2Push($curl, $base_url, $app_bundle_id, $message, $device_token, $jws) {

    $url = "{$base_url}/3/device/{$device_token}";
    // headers
    $headers = array(
        "apns-topic: {$app_bundle_id}",
        'Authorization: bearer ' . $jws
    );
    // other curl options
    curl_setopt_array($curl, array(
        CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_2_0,
        CURLOPT_URL => $url,
        CURLOPT_PORT => 443,
        CURLOPT_HTTPHEADER => $headers,
        CURLOPT_POST => TRUE,
        CURLOPT_POSTFIELDS => $message,
        CURLOPT_RETURNTRANSFER => TRUE,
        CURLOPT_TIMEOUT => 30,
        CURLOPT_SSL_VERIFYPEER => FALSE,
        CURLOPT_HEADER => 1
    ));
    // go...
    $result = curl_exec($curl);
    if ($result === FALSE) {
        throw new Exception("Curl failed: " .  curl_error($curl));
    }
    print_r($result."n");
    // get response
    $status = curl_getinfo($curl);
    return $status;
    }
    // open connection
    $curl = curl_init();
    sendHTTP2Push($curl, $base_url, $app_bundle_id, $message, $device_token, $jws);

    ?>

This is all working but how to I send it to a specific user?

Answer

You can send push notification to a selected device token.

Before sending follow these steps:

iOS Application side

On application launch get device token in didRegisterForRemoteNotificationsWithDeviceToken delegate
Send this token to server using API when user login in the application

Server side

Store this token in db table corresponding to the user id
Get device token from db corresponding to the user to whom you want to send notification
Send notification on that token
Notification will be received on device

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Answer