NordVPN client needs login, and under Linux want to use browser for authentication. The use of browser can be tedious, so we can use a simple parameter to despite browser.
nordvpn login --token mytoken
And stay in peace with the lonely terminal. In some other cases, users have also used another parameter, after login in the browser. You can generate or retrieve a token from your account.
nordvpn login --callback "nordvpn://success-uri-from-browser"
but I find it more verbose