An API Key gives you access to the API and the Testing UI.
Go to tellus.worldsibu.com and click New.
Fill the form accordingly and be sure to save the API Key, it won't be shown on screen again.
You will need it when communicating with the API or accessing the Testing UI.
Accessing the Testing UI
Add the API Key in the upper right menu (the gears icon) and refresh your screen.
Communicating with the API
Every request will need to pass a custom header called
x-access-key with the value generated for you.