Fix syntax error in API URL declaration in api_model.php

application/models/api_model.php

@@ -3,7 +3,7 @@
 class api_model extends Model {
 
   //private $API = 'https://hoponticket.com/api/index.php';
-  private API = 'https://preprod2.bbus.umsbox.hu/api/index.php';
+  private $API = 'https://preprod2.bbus.umsbox.hu/api/index.php';
   //private $API = 'https://php82fpm.umsbox.hu/api/index.php';
   //private $API = 'https://szollosil.bbus.umsbox.hu/api/index.php';