import { IosASWebauthenticationSession } from '@awesome-cordova-plugins/ios-aswebauthenticationsession-api/ngx';
constructor(private IosASWebauthenticationSession: ios-aswebauthenticationsession-api) { }
...
this.IosASWebauthenticationSession.start(callbackUrl, authorizeURL)
.then((redirectUrl: string) => console.log(redirectUrl))
.catch((error: any) => console.error(error));