public function declareRoutes(WordPressRouteCollector $r) {
        $r->addGroup('/v1', function (WordPressRouteCollector $r) {
            // REST handlers
            $cset = new REST\ComboSet();
            $cgroup = new REST\ComboGroup();
            $groupitem = new REST\GroupItem();

            // Admin REST routes
            $roles = ['wc_management', 'administrator', 'editor'];
            $r->add('POST', '/comboset/create/{skuMetaId}', [$cset, 'create'], [], [], $roles);
            $r->add('POST', '/comboset/delete/{comboSetId}', [$cset, 'delete'], [], [], $roles);
            $r->add('POST', '/combogroup/create/{comboSetId}', [$cgroup, 'create'], [], [], $roles);
            $r->add('POST', '/combogroup/get/{comboSetId}', [$cgroup, 'get'], [], [], $roles);
            $r->add('POST', '/combogroup/update/{groupId}', [$cgroup, 'update'], [], [], $roles);
            $r->add('POST', '/combogroup/delete/{groupId}', [$cgroup, 'delete'], [], [], $roles);
            $r->add('POST', '/combogroup/duplicate/{groupId}', [$cgroup, 'duplicate'], [], [], $roles);
            $r->add('POST', '/combogroup/reorder/{comboSetId}', [$cgroup, 'reorder'], [], [], $roles);
            $r->add('POST', '/groupitem/create/{groupId}', [$groupitem, 'create'], [], [], $roles);
            $r->add('POST', '/groupitem/get/{groupId}', [$groupitem, 'get'], [], [], $roles);
            $r->add('POST', '/groupitem/update/{itemId}', [$groupitem, 'update'], [], [], $roles);
            $r->add('POST', '/groupitem/delete/{itemId}', [$groupitem, 'delete'], [], [], $roles);
            $r->add('POST', '/groupitem/reorder/{groupId}', [$groupitem, 'reorder'], [], [], $roles);
        });
    }