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/Filament/Resources/Webhooks/Pages/CreateWebhook.php

@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Filament\Resources\Webhooks\Pages;
+
+use App\Filament\Resources\Webhooks\WebhookResource;
+use Filament\Resources\Pages\CreateRecord;
+use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Str;
+
+/**
+ * The secret is made here and shown once, on the page that opens next.
+ */
+class CreateWebhook extends CreateRecord
+{
+    protected static string $resource = WebhookResource::class;
+
+    protected string $secret = '';
+
+    protected function mutateFormDataBeforeCreate(array $data): array
+    {
+        $this->secret = Str::random(40);
+
+        return [...$data, 'secret' => $this->secret];
+    }
+
+    protected function afterCreate(): void
+    {
+        $this->record->forceFill(['created_by' => Auth::id()])->save();
+
+        WebhookResource::showSecret($this->secret);
+    }
+
+    protected function getCreatedNotification(): null
+    {
+        return null;
+    }
+
+    protected function getRedirectUrl(): string
+    {
+        return WebhookResource::getUrl('edit', ['record' => $this->record]);
+    }
+}