NOTE: Before getting started you may want to backup your website.
- Disable compilations via System->Tools->Compilations
- Extract the package
- Copy the app folder into your website home/root directory [merge contents]
- Clear cache by going into System->Cache Management, selecting all the files in the list, choosing the refresh option in the dropdown menu, and finally clicking Submit.
- Now log out of your admin panel, and log back in again
To add the webhook go to System->Configuration->GO MEDIA EXSTENTIONS->Web Hook Settings