Basic WebSocket implementaion

Downgrade to Socket.io 2.3.0

src/app/pay/pay.component.ts

@@ -0,0 +1,15 @@
+import { Component, OnInit } from '@angular/core';
+
+@Component({
+  selector: 'app-pay',
+  templateUrl: './pay.component.html',
+  styleUrls: ['./pay.component.css']
+})
+export class PayComponent implements OnInit {
+
+  constructor() { }
+
+  ngOnInit(): void {
+  }
+
+}