yarn add @personaclick/rn-sdk

yarn add https://github.com/PersonaClick/rn-sdk.git

yarn add @react-native-async-storage/async-storage
yarn add react-native-device-info
yarn add react-native-push-notification
yarn add @react-native-community/push-notification-ios
yarn add @react-native-firebase/app
yarn add @react-native-firebase/messaging

#import <UserNotifications/UNUserNotificationCenter.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate, RCTBridgeDelegate, UNUserNotificationCenterDelegate>

#import <UserNotifications/UserNotifications.h>
#import <RNCPushNotificationIOS.h>
#import <Firebase.h>

// Required for the register event.
- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
 [RNCPushNotificationIOS didRegisterForRemoteNotificationsWithDeviceToken:deviceToken];
}
// Required for the notification event. You must call the completion handler after handling the remote notification.
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
  [RNCPushNotificationIOS didReceiveRemoteNotification:userInfo fetchCompletionHandler:completionHandler];
}
// Required for the registrationError event.
- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error
{
 [RNCPushNotificationIOS didFailToRegisterForRemoteNotificationsWithError:error];
}
// Required for localNotification event
- (void)userNotificationCenter:(UNUserNotificationCenter *)center
didReceiveNotificationResponse:(UNNotificationResponse *)response
         withCompletionHandler:(void (^)(void))completionHandler
{
  [RNCPushNotificationIOS didReceiveNotificationResponse:response];
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  ...
  // Define UNUserNotificationCenter
  UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
  center.delegate = self;

  return YES;
}

//Called when a notification is delivered to a foreground app.
-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler
{
  completionHandler(UNNotificationPresentationOptionSound | UNNotificationPresentationOptionAlert | UNNotificationPresentationOptionBadge);
}

cd ios/
pod install

{
    "react-native": {
        "messaging_ios_auto_register_for_remote_messages": false
    }
}

On iOS devices, the user is able to toggle Background App Refresh in device's Settings. Furthermore, the Background App Refresh setting will automatically be off if the device is in low power mode.

If the iOS Background App Refresh mode is off, the handler configured in setBackgroundMessageHandler won't be triggered.

// index.js
import { AppRegistry } from 'react-native';

function HeadlessCheck({ isHeadless }) {
  if (isHeadless) {
    // App has been launched in the background by iOS, ignore
    return null;
  }

  return <App />;
}

function App() {
  // Your application
}

AppRegistry.registerComponent('app', () => HeadlessCheck);

// add this import statement at the top of your `AppDelegate.m` file
#import "RNFBMessagingModule.h"

// in "(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions" method
// Use `addCustomPropsToUserProps` to pass in props for initialization of your app
// Or pass in `nil` if you have none as per below example
// For `withLaunchOptions` please pass in `launchOptions` object
NSDictionary *appProperties = [RNFBMessagingModule addCustomPropsToUserProps:nil withLaunchOptions:launchOptions];

// Find the `RCTRootView` instance and update the `initialProperties` with your `appProperties` instance
RCTRootView *rootView = [[RCTRootView alloc] initWithBridge:bridge
                                             moduleName:@"nameOfYourApp"
                                             initialProperties:appProperties];

buildscript { 
    dependencies {
        classpath 'com.google.gms:google-services:4.3.4'
        // ...
    }
    // ...
}

apply plugin: 'com.google.gms.google-services'