this Gus.ini is usually located at
Windows:
..\Steam\steamapps\common\ARK\ShooterGame\Saved\Config\WindowsNoEditor\
Linux:
../Steam/steamapps/common/ARK/ShooterGame/Saved/Config/LinuxNoEditor/

Main tag to put above. It's only required once.
can be omitted if already there, because of other mod parts

DebugLevel can go up to 5, but you'll only ever need level 4 to debug possible issues. Level 5 might be to much spam.

The StatisticsApiKey can be issued on the https://capitalism.plus website. As soon as you put in a valid API key, the StatisticsProcessor will start to collect trade logs and send them to the capitalism.plus database. There you'll be able to have a detailed view on what is happening in your servers' economy. If you have a shared config file, you can also put in the API Key in the Debug Log in-game, since API Keys can only be used once. This means if you have two maps active, then you'll need to create two subscriptions with corresponding API Key.

If a StatisticsProcessor is placed in your game world, every player will be prompted a policy widget to agree to applicable data protection declaration, terms of use and that the CC license was understood. This occures if the player looks at a Capitalism actor or interacts with it. You can additionally add your own rules to this widget with the following gus.ini line in this format:
<Name of Link>:;:<Link to your webpage>
You also need to escape slashes, see this example[paste.ee]
Here is the example for the space you'll have: http://prntscr.com/kjd7i5