To build a JAR file, run the gradle command:

./gradlew shadowJar

Or just run the main method in the Main class.

As we use the Spotify WebAPI in development mode, you need to edit the list of authorized users if you want to run this software on behalf of a foreign spotify user account: https://developer.spotify.com/dashboard/b7cea7e9e1af4b16b985cd76af7ea846/users