how to enable firebase notifications in ionic android application

i want to build an application and use firebase for notification done a lot of search over google but did not find any good guide and solution , everything i tried ended into some errors . i tried ionic docs but they are all messy after the ionic v4 they shows everything about v4 i have my app almost finished up just this thing remains . i will appreciate any help . Any idea how to proceed? I'm most probably not configuring Firebase properly. I have placed google-services.json in the root directory, no problems there. but after that its all out of my understanding

 AN ERROR OCCURRED WHILE RUNNING ionic cordova plugin add phonegap-plugin-push --variable SENDER_ID-150482406038 --SAVE EXIT CODE 1

Got this Working . Thanks everyone for help! refrences used-

• https://ionicframework.com/docs/v3/native/push/
• https://github.com/phonegap/phonegap-plugin-push

works for

1. ionic 3.20.1
2. cordova 8.1.2

steps i followed

1. Removed my android platform using ionic cordova platform removeandroid then i created it agin ionic cordova platform add android. just to avoid any errors which my be there with my old android version.

2. Got the google-services.json and placed it in the rootDirectoryOfApp\platforms\android\app

3. then i run $ ionic cordova plugin add phonegap-plugin-push $ npm install --save @ionic-native/push@4
4. Edit config.xml look for <platform name="android"> under that i wrote <resource-file src="google-services.json" target="app/google-services.json" />

5. Edit package.json look for "phonegap-plugin-push" and edit it something like this

   "phonegap-plugin-push": {
       "ANDROID_SUPPORT_V13_VERSION": "27.+", // already there
       "FCM_VERSION": "11.6.2", // already there
       "SENDER_ID": "numeric key obtain from firebase console" // added
     },
   

6. Open app.module.ts and import import { Push } from '@ionic-native/push'; add Push under providers there ... providers: [ StatusBar, SplashScreen, Push, ....

7. Then in a provider i imported import { Push, PushObject, PushOptions } from '@ionic-native/push'; then in costructor i added private push: Push, and in the class of that provider i wrote a function like below

   pushSetup(){

   // to check if we have permission
   this.push.hasPermission()
   
   .then((res: any) => {
   if (res.isEnabled) {
   console.log('We have permission to send push notifications');
   } else {
   
   console.log('We do not have permission to send push notifications');
   }
   });    
   // Create a channel (Android O and above). You'll need to provide the id, description and importance properties.
   
   this.push.createChannel({
   id: "testchannel1",
   description: "My first test channel",
   // The importance property goes from 1 = Lowest, 2 = Low, 3 = Normal, 4 = High and 5 = Highest.
   importance: 3
   
   }).then(() => console.log('Channel created'));
   // Delete a channel (Android O and above)
   this.push.deleteChannel('testchannel1').then(() => console.log('Channel deleted'));  
   
   
   
   // Return a list of currently configured channels
   this.push.listChannels().then((channels) => console.log('List of channels', channels))    
   // to initialize push notifications  
   
   const options: PushOptions = {
   android: {
   senderID:"150482406038",
   },
   
   ios: {
   alert: 'true',
    badge: true,
   sound: 'false'
   },     
   };
   
   const pushObject: PushObject = this.push.init(options);     
   pushObject.on('notification').subscribe((notification: any) => console.log('Received a notification', notification));     
   pushObject.on('registration').subscribe((registration: any) => console.log('Device registered', registration));     
   pushObject.on('error').subscribe(error => console.error('Error with Push plugin', error));
   }
   

8. Now imported that provider where I want to use that , and called that function from there . but call it only after
   this.platform.ready().then(() => { or when a successful login.

I have shared this because i found it little difficult and got confusing guides over web Please comment if you found it wrong or not working in your case.