public function ajax_wpla_load_market_details()
 {
     // TODO: check nonce
     if (isset($_REQUEST['market_id'])) {
         // $market = WPLA_AmazonMarket::getMarket( $_REQUEST['market_id'] );
         $market = new WPLA_AmazonMarket($_REQUEST['market_id']);
         // echo "<pre>";print_r($market);echo"</pre>";
         if ($market) {
             // build response
             $response = new stdClass();
             $response->url = $market->url;
             $response->code = $market->code;
             $response->signin_url = $market->getSignInUrl();
             $response->developer_id = $market->developer_id;
             $response->success = true;
             $this->returnJSON($response);
             exit;
         } else {
             echo "invalid marketplace id";
         }
     }
 }