Hi there,
The issue here is that Terra (like most APIs) can only access URLs that are publically available via the internet. However it seems you are attempting to provide a loopback URL which is only available within your machine and local testing environment; if you wish to test your local server with Terra, try using a software like Ngrok like so:
- Setup Ngrok by creating an account and downloading the CLI tool
- Open your terminal and navigate to your project
- Run the command
ngrok http 8080
- Copy the Forwarding url + your webhook path
- Paste this on the dashboard when setting up your webhook