text: /* Node Modules */
  
  const express = require("express");
  const cors = require("cors");
  const bodyParser = require("body-parser");
  
  /* Settings */
  
  const app = express();
  app.use(cors());
  app.use(bodyParser.json());
  
  const port = 4000;
  
  /* Routing */
  
  app.get("/", (req, res) => res.send("Hello World!"));
  
  const customDataInfomations = { subscription: null };
  
  const saveDataInfo = async subscription => {
      
      customDataInfomations.subscription = subscription;
      
  };
  
  
  app.post("/data-push-request", async (req, res) => {
  
      const subscription = req.body;
      
      await saveDataInfo(subscription);
      
      res.json({ message: "success" });
      
  });
  
  app.listen(port, () => console.log(`App listening on port ${port}!`));
  