server.js

const express = require('express')
const cors = require('cors')
const bodyParser = require('body-parser')
const path = require('path')

if (process.env.NODE_ENV !== 'production')
    require('dotenv').config();

const stripe = require('stripe')(process.env.STRIPE_SECRET_KEY);

const app = express()
const port = process.env.PORT || 5000

//Middleware To convert all incoming req to process in JSON
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

app.use(cors());

if (process.env.NODE_ENV === 'production') {
    app.use(express.static(path.join(__dirname, 'client/build')));

    app.get('*', function (req, res) {
        res.sendFile(path.join(__dirname, 'client/build', 'index.html'))
    });
}

app.listen(port, error => {
    if (error) throw error;
    console.log('Server running on PORT => ' + port);
});

app.post('/payment', (req, res) => {
    const body = {
        source: req.body.token.id,
        amount: req.body.amount,
        currency: 'inr',
        description: "My First Test Charge (created for API docs)"
    }
    stripe.charges.create(body,
        function (err, charge) {
            if (err) {
                res.status(500).send({ error: stripeErr });
            } else {
                res.status(200).send({ success: charge });
            }
        });
});