Board Thread:Support Requests - Getting Technical/@comment-24551580-20160504212503/@comment-1757994-20160506000500

If you're not passing your login cookie back, that's the problem, not the API call itself, although your OP had a few extraneous data pairs.

The login cookie needs at least wikicities_session and access_token values. Since JavaScript runs in the browser, the browser worries about the cookies.