In your resources/views folder, create your folder and install-sucess.blade.php file, and then within shopify-auth.app_name, set your view_install_success_path value to whatever it is (see below in configure app for example). Set the middleware on routes - ensure that ShopifyAuthCheck if sitting around the routes. Web too, but I think that is standard in the web.php file. Also note that when creating routes, the appname must be second in the url route e.g. apps/app_name/create.