Hi Mark,

As part of the angular controller, you can add in $routeParams as a property that can be injected. That then has an id field which you can use to pass to the API endpoint/resource factory. An example for a custom section we have in our sites is:

function tVTreeController($scope, $http, $routeParams, umbRequestHelper, tVTreeResources, tVResources) {
var vm = this;
vm.id = $routeParams.id;
vm.search = '';


function init() {
    tVTreeResources.getItem(vm.id).then(function (results) {
        if (results.folder !== null) {
            vm.view = 'folder';
            vm.folder = results.folder;
        } else {
            vm.view = 'video';
            vm.video = results.video;
        }
    });
}

    init();
}

I have the if, as the tree is made up of 2 types of items.

Hope this helps

Kind Regards, Ben