Separated laravel app to its own folder (#540)

api/app/Http/Middleware/IsNotSubscribed.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+
+class IsNotSubscribed
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @return mixed
+     */
+    public function handle(Request $request, Closure $next)
+    {
+        if ($request->user() && $request->user()->subscribed()) {
+            // This user is a paying customer...
+            if ($request->expectsJson()) {
+                return response([
+                    'message' => 'You are already subscribed to NotionForms Pro.',
+                    'type' => 'error',
+                ], 401);
+            }
+
+            return redirect('billing');
+        }
+
+        return $next($request);
+    }
+}