function updateMarketplaceParticipations()
 {
     if (!$this->id) {
         return;
     }
     $api = new WPLA_AmazonAPI($this->id);
     $result = $api->listMarketplaceParticipations();
     if (@$result->success) {
         $this->allowed_markets = maybe_serialize($result->allowed_markets);
         $this->update();
     } elseif ($result->ErrorMessage) {
         wpla_show_message($result->ErrorMessage, 'error');
     }
     return $result;
 }