diff --git a/.env.example b/.env.example
index 5ce02157..994bd3e2 100644
--- a/.env.example
+++ b/.env.example
@@ -101,4 +101,6 @@ HARIM_ENCRYPTION_IV="1111000011110101"
 
 CHECKE_LIST_MACHINES_ACTIVITY_URL='fms.141.ir:7030/api/RMS/GetMovingVehicles',
 CHECKE_LIST_MACHINES_ACTIVITY_PASSWORD=
-CHECKE_LIST_MACHINES_ACTIVITY_USERNAME=
\ No newline at end of file
+CHECKE_LIST_MACHINES_ACTIVITY_USERNAME=
+
+HARIM_AMOUNT_PER=1
\ No newline at end of file
diff --git a/app/Http/Requests/V3/Dashboard/Harim/HarimOffice/ComputingPaymentRequest.php b/app/Http/Requests/V3/Dashboard/Harim/HarimOffice/ComputingPaymentRequest.php
index 0e51e601..63116bce 100644
--- a/app/Http/Requests/V3/Dashboard/Harim/HarimOffice/ComputingPaymentRequest.php
+++ b/app/Http/Requests/V3/Dashboard/Harim/HarimOffice/ComputingPaymentRequest.php
@@ -29,10 +29,42 @@ class ComputingPaymentRequest extends FormRequest
             'traffic' => 'required|numeric|decimal:0,1',
             'road_type' => 'required|numeric|decimal:0,1',
             'position' => 'required|numeric|decimal:0,1',
-            'final_area_space' => 'required|numeric|decimal:0,2',
-            'final_plan_space' => 'required|numeric|decimal:0,2',
-            'payment_amount' => 'required|numeric|decimal:0,2',
+            'final_area_space' => 'required|numeric|decimal:0,2', //عرصه
+            'final_plan_space' => 'required|numeric|decimal:0,2', // عیان
+            'payment_amount' => 'required|numeric',
             'expert_description' => 'required|string',
         ];
     }
+
+    public function after(): array
+    {
+        return [
+            function () {
+                $fe = config('harim_web_services.Harim_Payment.per');
+                $arse = (
+                    $this->traffic *
+                    $this->road_type *
+                    $this->position *
+                    $fe*
+                    $this->final_area_space
+                );
+                $ayan =(
+                    $this->traffic *
+                    $this->road_type *
+                    $this->position *
+                    $fe*
+                    $this->final_plan_space
+                );
+                $result = floor($arse + $ayan);
+
+                if ($result !== $this->payment_amount) {
+                    $this->validator->errors()->add(
+                        'payment_amount',
+                        'payment_amount مقادیر بدست امده صحیح نمی باشد.'
+                    );
+                }
+            }
+        ];
+    }
+
 }
diff --git a/config/harim_web_services.php b/config/harim_web_services.php
index 437739e7..1b1e6f65 100644
--- a/config/harim_web_services.php
+++ b/config/harim_web_services.php
@@ -35,4 +35,8 @@ return [
         'key' => env('HARIM_ENCRYPTION_KEY'),
         'iv' => env('HARIM_ENCRYPTION_IV'),
     ],
+
+    'Harim_Payment' => [
+        'per' => env('HARIM_AMOUNT_PER'),
+    ]
 ];