Manage webhooks from the panel

Create one and see its secret once, send a test, change the secret, and read
each delivery with what the other end answered.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/Support/Webhooks/Webhooks.php

@@ -9,6 +9,7 @@ use App\Models\Application;
 use App\Models\ReviewComment;
 use App\Models\Revision;
 use App\Models\Webhook;
+use App\Models\WebhookDelivery;
 use App\Support\AdminContent;
 use App\Support\ContentTypes;
 use App\Support\SiteUrls;
@@ -43,6 +44,38 @@ final class Webhooks
         }
     }
 
+    /**
+     * A `ping`, to check the receiving end before anything real happens.
+     */
+    public static function ping(Webhook $webhook): WebhookDelivery
+    {
+        $delivery = $webhook->deliveries()->create([
+            'uuid' => (string) Str::uuid(),
+            'event' => 'ping',
+            'payload' => ['webhook' => $webhook->id, 'events' => $webhook->events],
+        ]);
+
+        DeliverWebhook::dispatch($delivery);
+
+        return $delivery->refresh();
+    }
+
+    /**
+     * One sent again, as a new delivery of the same event and payload.
+     */
+    public static function redeliver(WebhookDelivery $delivery): WebhookDelivery
+    {
+        $again = $delivery->webhook->deliveries()->create([
+            'uuid' => (string) Str::uuid(),
+            'event' => $delivery->event,
+            'payload' => $delivery->payload,
+        ]);
+
+        DeliverWebhook::dispatch($again);
+
+        return $again->refresh();
+    }
+
     public static function applicationReceived(Application $application): void
     {
         self::dispatch('application.received', [