Made a cron controller.

app/Http/Controllers/CronController.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace FireflyIII\Http\Controllers;
+
+use FireflyIII\User;
+
+/**
+ * Class WebhookController
+ *
+ * @package FireflyIII\Http\Controllers
+ */
+class CronController extends Controller
+{
+
+    /**
+     *
+     */
+    public function sendgrid()
+    {
+
+        $URL        = 'https://api.sendgrid.com/api/bounces.get.json';
+        $parameters = [
+            'api_user' => env('SENDGRID_USERNAME'),
+            'api_key'  => env('SENDGRID_PASSWORD'),
+            'date'     => 1,
+            'days'     => 7
+        ];
+        $fullURL    = $URL . '?' . http_build_query($parameters);
+        $data       = json_decode(file_get_contents($fullURL));
+        $users      = [];
+        // loop the result, if any.
+        if (is_array($data)) {
+            foreach ($data as $entry) {
+                $address = $entry->email;
+                $users[] = User::where('email', $address);
+
+
+            }
+        }
+
+        /** @var User $user */
+        foreach($users as $user) {
+            if($user) {
+                // block because bounce.
+            }
+        }
+
+    }
+
+}