This is a simple server that understands the webhook format for Schema Publish subscriptions and downloads the published schema and prints it out.
To install the required node modules run npm install.
You can use a tool such as ngrok to get a temporary public url so Apollo can send webhooks. This will show an example when using ngrok.
Install ngrok and setup the authtoken docs.
Run the node server with node index.js then run ngrok http 8080 to start ngrok. Use the forwarding url as the url for the webhook in Apollo Studio.
Create a deployed graph in Apollo Studio docs
Register a schema to your graph docs
Set up a webhook notification using the forwarding url from above docs