API v2 /usrs/{userId}/token SECRET_TOKEN is not working and seems unclear what is required

Hey!
You have to generate an access token after authorizing your General app.
Once you authorize the app, you will receive an authorization code in your URL, you will grab that one to make a call to our OAuth endpoint to get an access token.

Here is a blog that might be helpful

Here is a sample app that might help you as a guide too: