AWS Lambda HTTPS post to Paypal IPN error - post

Question

I have been trying to implement Paypal's IPN using AWS Api Gateway to get an IPN handler url. the api is integrated with a Lambda function as the "receiver".
I have tested the api gateway url using Paypal's IPN simulator.It works for the first step and I get this message "IPN was sent and the handshake was verified".
My problem is now with the next step,where I have to send the recived message back to Paypal using HTTPS post. I have tried a number of times and keep getting this error:
{
"code": "ECONNREFUSED",
"errno": "ECONNREFUSED",
"syscall": "connect",
"address": "127.0.0.1",
"port": 443
}
I really would appreciate some help in getting this to work.
I'm using node.js 8.10.Here's my Lambda function:
exports.handler = (event, context, callback) => {
console.log('Received event:', JSON.stringify(event, null, 2));
// Return 200 to caller
console.log('sending 200 back to paypal');
callback(null, {
statusCode: '200'
});
// Read the IPN message sent from PayPal and prepend 'cmd=_notify-validate'
console.log('modifying return body...');
var body = 'cmd=_notify-validate&' + event.body;
callHttps(body, context);};
function callHttps(body, context) {
console.log('in callHttp()....');
var https = require('https');
var options = {
url: 'https://ipnpb.sandbox.paypal.com/cgi-bin/webscr',
method: 'POST',
headers: {
"user-agent": "Nodejs-IPN-VerificationScript"
},
body: body
};
const req = https.request(options, (res) => {
res.on('data', (chunk) => {
// code to execute
console.log("on data - can execute code here....");
});
res.on('end', () => {
// code to execute
console.log("on end - can execute code here....");
});
});
req.on('error', (e) => {
console.log("Error has occured: ", JSON.stringify(e, null, 2));
});
req.end();}

Answer 1

managed to sort it out.i was using url instead of breaking it down to host and path.here's the full code that worked for me:
exports.handler = (event, context, callback) => {
console.log('Received event:', JSON.stringify(event, null, 2));
// Return 200 to caller
console.log('sending 200 back to paypal');
callback(null, {
statusCode: '200'
});
callHttps(event.body, context);};
function callHttps(body, context) {
console.log('in callHttp()....');
// Read the IPN message sent from PayPal and prepend 'cmd=_notify-validate'
console.log('modifying return body...');
var bodyModified = 'cmd=_notify-validate&' + body;
var https = require('https');
var options = {
host: "ipnpb.sandbox.paypal.com",
path: "/cgi-bin/webscr",
method: 'POST',
headers: {
'user-agent': 'Nodejs-IPN-VerificationScript',
'Content-Length': bodyModified.length,
}
};
const req = https.request(options, (res) => {
console.log('statusCode:', res.statusCode);
console.log('headers:', res.headers);
var result = '';
res.on('data', (d) => {
// get the result here
result += d;
});
res.on('end', (end) => {
// check the result
if (result === 'VERIFIED') {
// process the message
// split the message
var res = body.split("&");
// create an object
var paypalMessageObject = new Object();
// loop through split array
res.forEach(element => {
// split element
var temp = (element.toString()).split("=");
// add to the object
paypalMessageObject[temp[0]] = temp[1];
});
console.log('paypalMessageObject: ' + JSON.stringify(paypalMessageObject, null, 2));
var checkItems = {
payment_status: paypalMessageObject.payment_status,
mc_gross: paypalMessageObject.mc_gross,
mc_currency: paypalMessageObject.mc_currency,
txn_id: paypalMessageObject.txn_id,
receiver_email: paypalMessageObject.receiver_email,
item_number: paypalMessageObject.item_number,
item_name: paypalMessageObject.item_name
};
console.log('checkItems: ', JSON.stringify(checkItems, null, 2));
}
else { console.log('not verified, now what?'); }
});
});
req.on('error', (e) => {
console.log("Error has occured: ", JSON.stringify(e, null, 2));
});
req.write(bodyModified);
req.end();}