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index.js
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index.js
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const express = require("express");
const https = require("https");
const qs = require("querystring");
const checksum_lib = require("./Paytm/checksum");
const config = require("./Paytm/config");
const app = express();
const parseUrl = express.urlencoded({ extended: false });
const parseJson = express.json({ extended: false });
const PORT = process.env.PORT || 3000;
app.get("/", (req, res) => {
res.sendFile(__dirname + "/index.html");
});
app.get('/payment', (req, res) => {
res.sendFile(__dirname + '/payment.html')
})
app.get('/chart', (req, res) => {
res.sendFile(__dirname + '/chart.html')
})
app.get('/pdf', (req, res) => {
res.sendFile(__dirname + '/pdf.html')
})
app.get('/form', (req, res) => {
res.sendFile(__dirname + '/form.html')
})
app.post("/paynow", [parseUrl, parseJson], (req, res) => {
// Route for making payment
var paymentDetails = {
amount: req.body.amount,
customerId: req.body.name,
customerEmail: req.body.email,
customerPhone: req.body.phone
}
if(!paymentDetails.amount || !paymentDetails.customerId || !paymentDetails.customerEmail || !paymentDetails.customerPhone) {
res.status(400).send('Payment failed')
} else {
var params = {};
params['MID'] = config.PaytmConfig.mid;
params['WEBSITE'] = config.PaytmConfig.website;
params['CHANNEL_ID'] = 'WEB';
params['INDUSTRY_TYPE_ID'] = 'Retail';
params['ORDER_ID'] = 'TEST_' + new Date().getTime();
params['CUST_ID'] = paymentDetails.customerId;
params['TXN_AMOUNT'] = paymentDetails.amount;
params['CALLBACK_URL'] = 'http://localhost:3000/callback';
params['EMAIL'] = paymentDetails.customerEmail;
params['MOBILE_NO'] = paymentDetails.customerPhone;
checksum_lib.genchecksum(params, config.PaytmConfig.key, function (err, checksum) {
var txn_url = "https://securegw-stage.paytm.in/theia/processTransaction"; // for staging
// var txn_url = "https://securegw.paytm.in/theia/processTransaction"; // for production
var form_fields = "";
for (var x in params) {
form_fields += "<input type='hidden' name='" + x + "' value='" + params[x] + "' >";
}
form_fields += "<input type='hidden' name='CHECKSUMHASH' value='" + checksum + "' >";
res.writeHead(200, { 'Content-Type': 'text/html' });
res.write('<html><head><title>Merchant Checkout Page</title></head><body><center><h1>Please do not refresh this page...</h1></center><form method="post" action="' + txn_url + '" name="f1">' + form_fields + '</form><script type="text/javascript">document.f1.submit();</script></body></html>');
res.end();
});
}
});
app.post("/callback", (req, res) => {
// Route for verifiying payment
var body = '';
req.on('data', function (data) {
body += data;
});
req.on('end', function () {
var html = "";
var post_data = qs.parse(body);
// received params in callback
console.log('Callback Response: ', post_data, "\n");
// verify the checksum
var checksumhash = post_data.CHECKSUMHASH;
// delete post_data.CHECKSUMHASH;
var result = checksum_lib.verifychecksum(post_data, config.PaytmConfig.key, checksumhash);
console.log("Checksum Result => ", result, "\n");
// Send Server-to-Server request to verify Order Status
var params = {"MID": config.PaytmConfig.mid, "ORDERID": post_data.ORDERID};
checksum_lib.genchecksum(params, config.PaytmConfig.key, function (err, checksum) {
params.CHECKSUMHASH = checksum;
post_data = 'JsonData='+JSON.stringify(params);
var options = {
hostname: 'securegw-stage.paytm.in', // for staging
// hostname: 'securegw.paytm.in', // for production
port: 443,
path: '/merchant-status/getTxnStatus',
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
'Content-Length': post_data.length
}
};
// Set up the request
var response = "";
var post_req = https.request(options, function(post_res) {
post_res.on('data', function (chunk) {
response += chunk;
});
post_res.on('end', function(){
console.log('S2S Response: ', response, "\n");
var _result = JSON.parse(response);
if(_result.STATUS == 'TXN_SUCCESS') {
res.send('payment sucess')
}else {
res.send('payment failed')
}
});
});
// post the data
post_req.write(post_data);
post_req.end();
});
});
});
app.listen(PORT, () => {
console.log(`App is listening on Port ${PORT}`);
});