Add all files

app/Http/Requests/Api/Admin/Services/UpdateServiceRequest.php

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+<?php
+
+namespace App\Http\Requests\Api\Admin\Services;
+
+use App\Http\Requests\Api\Admin\AdminApiRequest;
+
+class UpdateServiceRequest extends AdminApiRequest
+{
+    protected $permission = 'services.update';
+
+    public function rules(): array
+    {
+        return [
+            'product_id' => 'required|exists:products,id',
+            'plan_id' => [
+                'required',
+                'exists:plans,id',
+                function ($attribute, $value, $fail) {
+                    $productId = $this->input('product_id');
+                    if ($productId && !\App\Models\Plan::where('id', $value)->where('priceable_type', Product::class)->where('priceable_id', $productId)->exists()) {
+                        // Check if the plan belongs to the specified product
+                        $fail('The selected plan does not belong to the specified product.');
+                    }
+                },
+            ],
+            'user_id' => 'required|exists:users,id',
+            /**
+             * @default 1
+             */
+            'quantity' => 'required|integer|min:1',
+            /**
+             * @default pending
+             */
+            'status' => 'required|in:pending,active,cancelled,suspended',
+            'expires_at' => 'nullable|date|after_or_equal:today',
+            /**
+             * @example USD
+             */
+            'currency_code' => 'required|string|exists:currencies,code',
+            'price' => 'required|numeric|min:0',
+            'coupon_id' => 'nullable|exists:coupons,id',
+            'subscription_id' => 'nullable|string|max:255',
+            'order_id' => 'nullable|exists:orders,id',
+        ];
+    }
+}