You can set up debugging Webhooks using the following steps
Create a new channel on your server to receive the Webhooks, let’s say #Webhooks.
Go to Server Settings -> Webhooks -> Create Webhook. Select the #Webhooks channel, then copy the Webhook’s URL. It will look something like https://discordapp.com/api/webhooks/012345678901234567/VCj9yOOtJF9VCm-BU2F9xrbnoWD5gBZZ-UU1mZHcxi5VLgr3bPb9NanRJM8YD9cpBisL
In the Settings tab of your Heroku app add the following Config Variables (values extracted from your URL):
Restart your app’s worker node src/bot.js dyno, and you will begin to receive debugging messages in your #Webhooks channel.
If your bot in unresponsive, the first thing to check is Heroku. Log in and manually restart the worker node src/bot.js dyno.
For further troubleshooting, it’s helpful to install the Heroku command line interface. Once installed you can login from a terminal with heroku login and check your apps logs with heroku logs --tail -a <your-app-name>
If you are unable to solve a problem yourself, report it with as much detail as possible in this repo’s issue tracker.