Build Interactive Mobile Menus

const express = require("express");
const app = express();

app.use(express.urlencoded({ extended: true }));

app.post("/ussd/callback", (req, res) => {
  const { sessionId, serviceCode,
          phoneNumber, text } = req.body;

  let response = "";

  if (text === "") {
    // First request -- show main menu
    response = `CON Welcome to MyApp
1. Check Balance
2. Make Payment
3. Account Info`;
  } else if (text === "1") {
    // End session with balance
    response = "END Your balance is GHS 150.00";
  } else {
    response = "END Invalid option";
  }

  res.send(response);
});

app.listen(3000);

<?php

$sessionId   = $_POST["sessionId"];
$serviceCode = $_POST["serviceCode"];
$phone       = $_POST["phoneNumber"];
$text        = $_POST["text"];

if ($text == "") {
    // First request -- show main menu
    $response  = "CON Welcome to MyApp\n";
    $response .= "1. Check Balance\n";
    $response .= "2. Make Payment\n";
    $response .= "3. Account Info";
} elseif ($text == "1") {
    // End session with balance
    $response = "END Your balance is GHS 150.00";
} else {
    $response = "END Invalid option";
}

header("Content-type: text/plain");
echo $response;