Add all files

app/Http/Requests/Api/Admin/Users/CreateUserRequest.php

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+<?php
+
+namespace App\Http\Requests\Api\Admin\Users;
+
+use App\Http\Requests\Api\Admin\AdminApiRequest;
+
+class CreateUserRequest extends AdminApiRequest
+{
+    protected $permission = 'users.create';
+
+    public function rules(): array
+    {
+        return [
+            'first_name' => 'nullable|string|max:255',
+            'last_name' => 'nullable|string|max:255',
+            'email' => 'required|email|max:255|unique:users,email',
+            'password' => 'required|string|min:8',
+            'email_verified_at' => 'nullable|date',
+            'role_id' => 'nullable|exists:roles,id',
+        ];
+    }
+}

app/Http/Requests/Api/Admin/Users/DeleteUserRequest.php

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+<?php
+
+namespace App\Http\Requests\Api\Admin\Users;
+
+use App\Http\Requests\Api\Admin\AdminApiRequest;
+
+class DeleteUserRequest extends AdminApiRequest
+{
+    protected $permission = 'users.delete';
+}

app/Http/Requests/Api/Admin/Users/GetUserRequest.php

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+<?php
+
+namespace App\Http\Requests\Api\Admin\Users;
+
+use App\Http\Requests\Api\Admin\AdminApiRequest;
+
+class GetUserRequest extends AdminApiRequest
+{
+    protected $permission = 'users.view';
+}

app/Http/Requests/Api/Admin/Users/GetUsersRequest.php

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+<?php
+
+namespace App\Http\Requests\Api\Admin\Users;
+
+use App\Http\Requests\Api\Admin\AdminApiRequest;
+
+class GetUsersRequest extends AdminApiRequest
+{
+    protected $permission = 'users.view';
+}

app/Http/Requests/Api/Admin/Users/UpdateUserRequest.php

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+<?php
+
+namespace App\Http\Requests\Api\Admin\Users;
+
+use App\Http\Requests\Api\Admin\AdminApiRequest;
+
+class UpdateUserRequest extends AdminApiRequest
+{
+    protected $permission = 'users.update';
+
+    public function rules(): array
+    {
+        return [
+            'first_name' => 'nullable|string|max:255',
+            'last_name' => 'nullable|string|max:255',
+            'email' => 'required|email|max:255|unique:users,email,' . $this->route()->parameter('user')->id,
+            'password' => 'nullable|string|min:8',
+            'email_verified_at' => 'nullable|date',
+            'role_id' => 'nullable|exists:roles,id',
+        ];
+    }
+}