server.js

const express = require('express')
const path = require('path')

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

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

const app = express();

const port = process.env.PORT || 5000

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

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

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

app.post('/payment', (req, res) => {
    const body = {
        source: req.body.token.id,
        amount: req.body.amount,
        currency: "pln"
    }

    stripe.charges.create(body, (stripeErr, stripeRes) =>{
        if (stripeErr){
            res.status(500).send({error: stripeErr})
        } else {
            res.status(200).send({success: stripeRes})
        }
    })
})

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