diff --git a/src/Payment.php b/src/Payment.php
index 07c7e82..6f84986 100644
--- a/src/Payment.php
+++ b/src/Payment.php
@@ -14,12 +14,12 @@
     InvalidArgumentException,
     LocaleNotSetException,
     RequestFailedException};
-use RKocak\Vallet\Traits\URLHelper;
+use RKocak\Vallet\Traits\{HashesString, URLHelper};
 use SensitiveParameter;
 
 class Payment implements Arrayable, PaymentContract
 {
-    use URLHelper;
+    use HashesString, URLHelper;
 
     const VALLET_URL = 'https://www.vallet.com.tr/api/v1/create-payment-link';
 
@@ -231,7 +231,7 @@ protected function generateHash(): string
     {
         $str = $this->data['orderId'].$this->data['currency'].$this->data['orderPrice'].$this->data['productsTotalPrice'].$this->data['productType'].$this->callbackOkUrl.$this->callbackFailUrl;
 
-        return base64_encode(pack('H*', sha1($this->username.$this->password.$this->shopCode.$str.$this->hash)));
+        return $this->generateHash($this->username.$this->password.$this->shopCode.$str.$this->hash);
     }
 
     protected function getCallbackOkUrl(): string
diff --git a/src/Refund.php b/src/Refund.php
index 29b8a5e..81898d1 100644
--- a/src/Refund.php
+++ b/src/Refund.php
@@ -7,10 +7,13 @@
 use Illuminate\Support\Facades\Http;
 use RKocak\Vallet\Contracts\RefundContract;
 use RKocak\Vallet\Exceptions\{InvalidArgumentException, RequestFailedException};
+use RKocak\Vallet\Traits\HashesString;
 use SensitiveParameter;
 
 class Refund implements RefundContract
 {
+    use HashesString;
+
     const VALLET_REFUND_URL = 'https://www.vallet.com.tr/api/v1/create-refund';
 
     protected float|int $amount = 0;
@@ -63,7 +66,7 @@ public function process(): RefundResponse
         }
 
         $hashStr = $this->username.$this->password.$this->shopCode.$this->valletOrderId.$this->orderId.$this->amount.$this->hash;
-        $hash    = base64_encode(pack('H*', sha1($hashStr)));
+        $hash    = $this->generateHash($hashStr);
 
         $request = Http::withoutVerifying()->asForm()->post(static::VALLET_REFUND_URL, [
             'userName'      => $this->username,
diff --git a/src/Traits/HashesString.php b/src/Traits/HashesString.php
new file mode 100644
index 0000000..bf456a9
--- /dev/null
+++ b/src/Traits/HashesString.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace RKocak\Vallet\Traits;
+
+trait HashesString
+{
+    public function generateHash(string $str): string
+    {
+        return base64_encode(pack('H*', sha1($str)));
+    }
+}