Each user has a Docs API key. To generate, view, or regenerate the API key, click the “person” icon on the top right of your account, next to the search, then click Your Profile.
Next, click the Authentication link in the menu on the left and select the API Keys tab.
Note: If you don’t see an API key in your profile, it’s because you haven’t been granted the “Docs: Create new, edit settings & Collections” permission by the Account Owner or an Administrator.