\textcolor{pink}{\huge \textsf{WELCOME! ^-^}}
@Manekinari
Take the time to check out the FAQ and GUIDE if you haven’t already.
There’s also a lot of good stuff on the forum to help you, like:
The Ultimate Guide for WK
The Ultimate Additional Japanese Resources List!
The New And Improved List Of API and Third Party Apps
I hope your Japanese learning journey goes well and that you enjoy your time with us on the forums.
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To answer your question: you log into Tsurukame with your wanikani username and password, so you don’t need to use an API key 