Facebook Bot Not Posting

I followed https://botman.io/2.0/installation and Tinker works fine.

When I added my Facebook messenger bot, the verification works.
When chatting with the bot, I receive the POST request as per Postman and ngrok, it responds 200 OK.

**Problem**
But I don't get actual reply from the bot.

**Setup**
```json
"require": {
"php": "^7.1.3",
"botman/botman": "~2.0",
"botman/driver-facebook": "^1.9",
"botman/driver-web": "~1.0",
"botman/studio-addons": "~1.3",
"botman/tinker": "~1.0",
"fideloper/proxy": "^4.0",
"laravel/framework": "5.7.*",
"laravel/tinker": "^1.0"
}
```

**Possible cases**
- Graph version and endpoint mismatch
I am not sure if this matters but I noticed that the endpoint that the bot uses is for `v3.0`

https://github.com/botman/driver-facebook/commit/d26cb64bcb6087d7a55be3c4d4c0b25ff297fbc6

whereas as of writing new apps acquire `v3.2`


`laravel.log` is empty