WC_API_Server::add_pagination_headers PHP Method

    public function add_pagination_headers($query)
    {
        // WP_User_Query
        if (is_a($query, 'WP_User_Query')) {
            $page = $query->page;
            $single = count($query->get_results()) == 1;
            $total = $query->get_total();
            $total_pages = $query->total_pages;
            // WP_Query
        } else {
            $page = $query->get('paged');
            $single = $query->is_single();
            $total = $query->found_posts;
            $total_pages = $query->max_num_pages;
        }
        if (!$page) {
            $page = 1;
        }
        $next_page = absint($page) + 1;
        if (!$single) {
            // first/prev
            if ($page > 1) {
                $this->link_header('first', $this->get_paginated_url(1));
                $this->link_header('prev', $this->get_paginated_url($page - 1));
            }
            // next
            if ($next_page <= $total_pages) {
                $this->link_header('next', $this->get_paginated_url($next_page));
            }
            // last
            if ($page != $total_pages) {
                $this->link_header('last', $this->get_paginated_url($total_pages));
            }
        }
        $this->header('X-WC-Total', $total);
        $this->header('X-WC-TotalPages', $total_pages);
        do_action('woocommerce_api_pagination_headers', $this, $query);
    }