Embedding {custom} posts with REST API

I’m looking for a method to embed basing {custom} put up infomation, akin to put up title and few {custom} metas on different web site.

The simplest appears to be doing it in iFrame, however there are numerous “no’s”, you possibly can’t model it as a lot as you need and so forth. So after replace to 4.7 and avaiability of REST API I although it could be nice to make use of that, and retrievve wanted values with API name. However when I attempt to use https://instance.com/wp-json/wp/v2/posts/11 the place 11 is {custom} put up sort referred to as st_activity, I am getting put up content material and all the knowledge however my {custom} meta is lacking.

I’ve registered {custom} put up sort with API help, following

http://v2.wp-api.org/extending/custom-content-types/

including

'show_in_rest'       => true,
'rest_base'          => 'activity-api',
'rest_controller_class' => 'WP_REST_Posts_Controller',

and adjusted meta:

operate slug_register_rate_review() {
            register_rest_field( 'st_activity',
                'rate_review',
            array(
                'get_callback' => 'slug_get_st_activity',
                'update_callback' => null,
                'schema' => null,
            )
        );
    }

    operate slug_get_st_activity($put up, $field_name, $request) {
        return get_post_meta($put up['id'], 'rate_review' );
    }

Nicely, clearly I am doing one thing unsuitable however do not know what precisely.

And ddespite that, is it attainable and how you can get solely title, hyperlink, and {custom} meta with out all the opposite values? Thanks!