Robot Gylfie is a project specific assistance webhoook. You may not make use of it as is, but you welcome to borrow some code!
Due to the ES6 module system and Node.js native modules interaction, Robot Gylfie intended to run on Node 0.11.14 or higher. Simplest way to use nvm before run:
nvm use v0.11.14
npm install
npm start
Server starts at port 4567 and accept payloads at /payload path.