Configuration

Create a file named .env.php, in which you put the enviroment variables BASE_URL and AUTH.

putenv('BASE_URL=https://SOMETHING.atlassian.net/');
putenv('AUTH=SECRET_KEY');

On .config.php you may declare any particular behaviour

$categories Specifies which proyect's categories will be taken in mind for the report
$legacy and $on_hold Specifies a status that is decided manually

Be sure to fill atlassian-connect.json according to Jira

Any request, I'll be happy to help :)