Add all files

extensions/Others/KnowledgeBase/Livewire/KnowledgeBase/Index.php

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+<?php
+
+namespace Paymenter\Extensions\Others\KnowledgeBase\Livewire\KnowledgeBase;
+
+use Livewire\Component;
+use Paymenter\Extensions\Others\KnowledgeBase\Models\Article;
+
+class Index extends Component
+{
+    public function mount()
+    {
+        if (Article::where('is_active', true)->where('published_at', '<=', now())->count() == 0) {
+            return abort(404);
+        }
+    }
+
+    public function render()
+    {
+        return view('knowledgebase::index', [
+            'articles' => Article::where('is_active', true)
+                ->where('published_at', '<=', now())
+                ->latest('published_at')
+                ->get(),
+        ]);
+    }
+}

extensions/Others/KnowledgeBase/Livewire/KnowledgeBase/Show.php

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+<?php
+
+namespace Paymenter\Extensions\Others\KnowledgeBase\Livewire\KnowledgeBase;
+
+use Livewire\Component;
+use Paymenter\Extensions\Others\KnowledgeBase\Models\Article;
+
+class Show extends Component
+{
+    public Article $article;
+
+    public function mount(Article $article)
+    {
+        if (!$article->is_active || $article->published_at > now()) {
+            abort(404);
+        }
+
+        $this->article = $article;
+    }
+
+    public function render()
+    {
+        return view('knowledgebase::show', [
+            'article' => $this->article,
+        ]);
+    }
+}

extensions/Others/KnowledgeBase/Livewire/KnowledgeBase/Widget.php

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+<?php
+
+namespace Paymenter\Extensions\Others\KnowledgeBase\Livewire\KnowledgeBase;
+
+use Livewire\Component;
+use Paymenter\Extensions\Others\KnowledgeBase\Models\Article;
+
+class Widget extends Component
+{
+    public function mount()
+    {
+        if (Article::where('is_active', true)->where('published_at', '<=', now())->count() == 0) {
+            abort(404);
+        }
+    }
+
+    public function render()
+    {
+        return view('knowledgebase::widget', [
+            'articles' => Article::where('is_active', true)
+                ->where('published_at', '<=', now())
+                ->latest('published_at')
+                ->get(),
+        ]);
+    }
+}