Yoast_Update_Manager::call_remote_api PHP Method

        private function call_remote_api()
        {
            // only check if the failed transient is not set (or if it's expired)
            if (get_transient($this->request_failed_transient_key) !== false) {
                return false;
            }
            // start request process
            global $wp_version;
            // set a transient to prevent failed update checks on every page load
            // this transient will be removed if a request succeeds
            set_transient($this->request_failed_transient_key, 'failed', 10800);
            // setup api parameters
            $api_params = array('edd_action' => 'get_version', 'license' => $this->license_manager->get_license_key(), 'item_name' => $this->product->get_item_name(), 'wp_version' => $wp_version, 'item_version' => $this->product->get_version(), 'url' => home_url(), 'slug' => $this->product->get_slug());
            // Add product ID from product if it is implemented.
            if (method_exists($this->product, 'get_product_id')) {
                $product_id = $this->product->get_product_id();
                if ($product_id > 0) {
                    $api_params['product_id'] = $this->product->get_product_id();
                }
            }
            // setup request parameters
            $request_params = array('method' => 'POST', 'body' => $api_params);
            require_once dirname(__FILE__) . '/class-api-request.php';
            $request = new Yoast_API_Request($this->product->get_api_url(), $request_params);
            if ($request->is_valid() !== true) {
                // show error message
                $this->error_message = $request->get_error_message();
                add_action('admin_notices', array($this, 'show_update_error'));
                return false;
            }
            // request succeeded, delete transient indicating a request failed
            delete_transient($this->request_failed_transient_key);
            // decode response
            $response = $request->get_response();
            // check if response returned that a given site was inactive
            if (isset($response->license_check) && !empty($response->license_check) && $response->license_check != 'valid') {
                // deactivate local license
                $this->license_manager->set_license_status('invalid');
                // show notice to let the user know we deactivated his/her license
                $this->error_message = __("This site has not been activated properly on yoast.com and thus cannot check for future updates. Please activate your site with a valid license key.", $this->product->get_text_domain());
                add_action('admin_notices', array($this, 'show_update_error'));
            }
            $response->sections = maybe_unserialize($response->sections);
            // store response
            set_transient($this->response_transient_key, $response, 10800);
            return $response;
        }