Push By Category

Hope we should register the user here ..

register = function(os, token) {
        var baseUrl;
        baseUrl = 'http://example.com/pnfw';
        if (!baseUrl) {
            return $q.reject();
        }
        return $http({
            method: 'POST',
            url: baseUrl + '/register',
            headers: {
                'Content-Type': 'application/x-www-form-urlencoded'
            },
            transformRequest: function(obj) {
                var p, str;
                str = [];
                for (p in obj) {
                    str.push(encodeURIComponent(p) + '=' + encodeURIComponent(obj[p]));
                }
                return str.join('&');
            },
            data: {
                os: os,
                token: token
            }
        });
    };

token=device_id&os=iOS&id=3&exclude=true
where to add it? and we need to add multiple ids to the URL if the user wants to subscribe to multiple categories?