How to send push notification from one user to another in Ionic?

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• I want to passing id (stored in firestore) from page to another page in ionic4 App

  i want to passing ID that i stored it in Firestore database from page to another page in my Ionic4 App

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  All of the answers I found online say this could be due to multiple versions of rxjs in the project. But I only see one:

      PS C:\projectFolder> npm list rxjs
      MobileAppTemplate@0.0.1 C:\projectFolder
      +-- @angular-devkit/architect@0.12.4
      | `-- rxjs@6.3.3  deduped
      +-- @angular-devkit/build-angular@0.12.4
      | +-- @angular-devkit/build-webpack@0.12.4
      | | `-- rxjs@6.3.3  deduped
      | +-- @ngtools/webpack@7.2.4
      | | `-- rxjs@6.3.3  deduped
      | `-- rxjs@6.3.3  deduped
      +-- @angular-devkit/core@7.2.4
      | `-- rxjs@6.3.3  deduped
      +-- @angular-devkit/schematics@7.2.4
      | `-- rxjs@6.3.3  deduped
      +-- @angular/cli@7.2.4
      | +-- @schematics/update@0.12.4
      | | `-- rxjs@6.3.3  deduped
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      `-- rxjs@6.3.3
  

  Here's the code:

  import { Injectable } from '@angular/core';
  import { HttpClient } from '@angular/common/http';
  import { tap } from 'rxjs/operators';
  import { Observable, BehaviorSubject } from 'rxjs';
  import { Storage } from '@ionic/storage';
  
  import { User } from './user';
  import { AuthResponse } from './auth-response';
  
  @Injectable({
    providedIn: 'root'
  })
  export class AuthService {
  
      AUTH_SERVER_ADDRESS: string = "http://SERVERIP:8080/WebServicesTemplate";
      REGISTRATION_URL: string = this.AUTH_SERVER_ADDRESS + "/user/register";
      LOGIN_URL: string = this.AUTH_SERVER_ADDRESS + "/login";
      ACCESS_TOKEN_NAME: string = "ACCESS_TOKEN";
      ACCESS_TOKEN_EXPIRATION_TIME: string = "EXPIRES_IN";
      authSubject = new BehaviorSubject(false);
  
      constructor(private httpClient: HttpClient, private storage: Storage) { }
  
      register(user: User): Observable<AuthResponse> {
          return this.httpClient.post<AuthResponse>(`${this.REGISTRATION_URL}`, user)
              .pipe(
                  tap(async (response: AuthResponse) => {
                      if(response.user) {
                          await this.storage.set(this.ACCESS_TOKEN_NAME, response.user.accessToken);
                          await this.storage.set(this.ACCESS_TOKEN_EXPIRATION_TIME, response.user.expiresIn);
                          this.authSubject.next(true);
                      }
                  })
              );
      }// end register(.)
  
      login(user: User): Observable<AuthResponse> {
          return this.httpClient.post<AuthResponse>(`${this.LOGIN_URL}`, user, {observe: "response"})
              .pipe(
                  tap(async (response: AuthResponse ) => {
                      if(response.user) {
                          await this.storage.set(this.ACCESS_TOKEN_NAME, response.user.accessToken);
                          await this.storage.set(this.ACCESS_TOKEN_EXPIRATION_TIME, response.user.expiresIn);
                          this.authSubject.next(true);
                      }
                  })
              );
      }// end login(.)
  
      async logout() {
          await this.storage.remove(this.ACCESS_TOKEN_NAME);
          await this.storage.remove(this.ACCESS_TOKEN_EXPIRATION_TIME);
          this.authSubject.next(false);
      }
  
      isLoggedIn() {
          return this.authSubject.asObservable();
      }
  }
  

  What can I do to solve this?
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  EXPECTED RESULTS:

  • Hierarchy 1

    • Hierarchy 1.1
    • Hierarchy 1.2
      • Hierarchy 1.2.1

  • Hierarchy 2

    • Hierarchy 2.1

  • Hierarchy 3

  CODE HERE
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  $fields = array( 
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  'identifier' => "xxxxxxxxxxxxxxxxxxxxxxxxxxxx",
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      public function sendPush($text,$title,$email,$url,$imgUrl)
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      //echo $text.$title.'-'.$email.'-'.$url.'-'.$imgUrl;
      ini_set('display_errors',0);
  error_reporting(E_ALL); 
          $content = array(
              "nl" => ''.$text.''
              );
  
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          );
  
          $fields = json_encode($fields);
     // print("\nJSON sent:\n");
      //print($fields);
  
          $ch = curl_init();
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          curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json; charset=utf-8',
                                                     'Authorization: Basic OTE3YjliZGYtMmVmNi00NjAyLTgxNmItNDNkOTY2ZWM2OTY2'));
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          curl_setopt($ch, CURLOPT_HEADER, FALSE);
          curl_setopt($ch, CURLOPT_POST, TRUE);
          curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
          curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
  
          $response = curl_exec($ch);
          curl_close($ch);
  
          return $response;
  
  ini_set('display_errors',0);
  error_reporting(E_ALL);         
  }
  

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