add usage vs qtymin calc

productressources.php

@@ -64,7 +64,7 @@ $configOptions = Capsule::table('tblproductconfigoptions')
 
 $this->service = new Service();
 $this->serviceId = $id;
-$this->serialize->loadWhmcsService();
+$this->service->loadWhmcsService();
 $this->ressource = new ResourceManager();
 
 print_r($this->ressource);