fix non sandbox verification

@@ -237,7 +237,7 @@ abstract class ImmoScoutAPI extends GuzzleClient
         $stack->push($oAuth);
         $stack->push($oAuth);
 
 
         $client = new Client([
         $client = new Client([
-            'base_uri' => 'https://rest.sandbox-immobilienscout24.de/restapi/',
+            'base_uri' => $this->getBaseUrl(),
             'handler' => $stack,
             'handler' => $stack,
             'auth' => 'oauth',
             'auth' => 'oauth',
         ]);
         ]);