Registers the paginated REST API endpoint /wp-json/wpwf/v1/pins?page=1 reading from ACF or CPT:

add_action('rest_api_init', function () {
    register_rest_route('wpwf/v1', '/pins', array(
        'methods' => 'GET',
        'callback' => 'wpwf_get_paginated_pins',
        'permission_callback' => '__return_true'
    ));
});

function wpwf_get_paginated_pins(WP_REST_Request $request) {
    $page = $request->get_param('page') ?: 1;
    $query = new WP_Query(array(
        'post_type'      => 'shoppable_pin',
        'posts_per_page' => 8,
        'paged'          => $page,
        'post_status'    => 'publish'
    ));

    $results = array();
    while ($query->have_posts()) {
        $query->the_post();
        $results[] = array(
            'id'       => get_the_ID(),
            'title'    => get_the_title(),
            'img'      => get_the_post_thumbnail_url(get_the_ID(), 'large'),
            'hotspots' => get_field('hotspot_items'), // ACF Repeater
            'products' => get_field('linked_woo_skus')
        );
    }
    wp_reset_postdata();
    return rest_ensure_response($results);
}

Handles instant AJAX Add-to-Cart without refreshing the visual stream:

add_action('wp_ajax_wpwf_ajax_add_to_cart', 'wpwf_handle_ajax_cart');
add_action('wp_ajax_nopriv_wpwf_ajax_add_to_cart', 'wpwf_handle_ajax_cart');

function wpwf_handle_ajax_cart() {
    $product_id = absint($_POST['product_id']);
    $quantity   = 1;
    
    $passed = apply_filters('woocommerce_add_to_cart_validation', true, $product_id, $quantity);
    if ($passed && WC()->cart->add_to_cart($product_id, $quantity)) {
        wp_send_json_success(array(
            'cart_count' => WC()->cart->get_cart_contents_count(),
            'cart_total' => WC()->cart->get_cart_total()
        ));
    }
    wp_send_json_error();
}