1.Create app on ionic framework dashboard - ionic.io
2.Create app on linkedin console
a.Add required fields
b.setting->redirect url =https://api.ionic.io/auth/integrations/linkedin
c.set check for r_emailaddresses
d.Goto mobile tab enter Package Name(FROM config.xml) and Hash key of machine

3.create blank project
4.add cloud library command=>
npm install @ionic/cloud-angular --save
5.link our project to ionic framework project => ionic link and select you project
6. add plugins
1.cordova plugin add cordova-plugin-inappbrowser --save
2.cordova plugin add cordova-plugin-linkedin --variable APP_ID=YOUR_APP_ID

7.Link Linkedin to ionic dashboard
a.Goto your ionic project dashboard
b.Settings
c.User Auth
d.Linkedin->SETUP
e.enter Client Id and Client Secret of your linkedin app

8.app.module.ts
add below code-

a.import { CloudSettings, CloudModule } from '@ionic/cloud-angular';

b.const cloudSettings: CloudSettings = {
  'core': {
      'app_id': 'XXXXXX' //ionic app id
  }
}
c.add code in imports array<br>
 CloudModule.forRoot(cloudSettings)

9.Home.html
a.create button as follows in html file
<button ion-button (click)="login()"> Login with linkedin

10.home.ts
a.import
-import { Auth, User } from '@ionic/cloud-angular';
b.change your constructor
constructor(public navCtrl: NavController,public auth: Auth, public user: User) {}
c.create function login

login(){  	
	this.auth.login('linkedin').then((success)=>{
		alert('Logged In');
	});
}