Redmine

You will need to create a new Redmine installation. Go to https://www.redmine.org/projects/redmine/wiki/RedmineInstall and follow the instructions. Alternatively, you can use a Docker image: https://hub.docker.com/_/redmine or a hosted solution.

Once you have your Redmine application make sure you have the REST API enabled. Go to Administration -> Settings -> API and check the "Enable REST web service" option.

After that, you will need to create a new API key. Go to Administration -> Users -> Edit user and create a new API key.

You will enter this API key and also the URL of your Redmine installation in when connecting each Redmine component.