Trouble receiving notifications from iTunes Connect about IAP status change events

I've set up a URL on my server to receive auto-renewable IAP status change notifications per this article:

https://help.apple.com/itunes-connect/developer/#/dev0067a330b

And of course I've provided my URL to iTunes Connect via my app's main settings page.

However, I'm receiving neither update notifications nor any kind of message indicating that there's a problem.

Help troubleshooting? I don't even know where to start.

Thanks!

Have you checked secure network connection with your server? I mean that you have to check ATS on your server. I'm using nginx such as proxy server. First of all, you have to check your nginx system pair past with ATS to connect with apple server.

This method to check ATS pass on nginx server

nscurl --ats-diagnostics <your status receive url>

See more on apple documentation Using the nscurl Tool to Diagnose ATS Connection Issues

If your server passed. You are ready to receive response from apple.

My subscription status URL setup simple such as a simple http service created on nodejs ( express framwork )

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

process.on('uncaughtException', function (err) {
    console.log(err.stack);
});

process.on('exit', function (code) {
    console.log('About to exit with code: ' + code);
});

// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }))

// parse application/json
app.use(bodyParser.json())

app.post('/', function (req, res) {
    console.log(req.body); < response from apple is here >

    res.send({ ok: 1 });
})

const port = 12092;

app.listen(port, function () {
    console.log('Subscription status url ping on port ' + port);
});

By the way, you should update your question. you can reference from a other relation question on your question. This's more helpful!.