Initialize fastspring popup

home.component.ts

import { HostListener } from '@angular/core';
import { Component, OnInit } from '@angular/core';

declare var fastspring: any;

@Component({
  selector: 'app-home',
  templateUrl: './home.component.html',
  styleUrls: ['./home.component.css']
})

export class HomeComponent implements OnInit {

@HostListener('window:onFSPopupClosed', ['$event.detail'])
onFSPopupClosed(detail) {
  console.log(detail)
  if (detail && detail.orderReference && detail.orderReference.id) {
    // Payment done successfull
  }
}

constructor() {}

  popupStoreFront(itemIdentifier: string): void {
    fastspring.builder.push({
      reset: true,
      products: [
        { path: 'yearly', quantity: 1 }
      ],
      checkout: true,
      tags: {
        emailId: 'abc@gmail.com',
        userId: 'HJS678HJ'
      }
    });
  }
}