diff --git a/README.md b/README.md
index 360013b..95e652a 100644
--- a/README.md
+++ b/README.md
@@ -287,9 +287,9 @@ def go_to_gateway_view(request):
         return render(request, "redirect_to_bank.html")
 ```
 
-<h3 dir="rtl"> تنظیم SECURE_REFERRER_POLICY برای درگاه بانک ملی </h3>
+<h3 dir="rtl"> تنظیم SECURE_REFERRER_POLICY برای درگاه بانک ملی و سامان </h3>
 <p dir="rtl">
-برای استفاده از درگاه بانک ملی تنظیم SECURE_REFERRER_POLICY در setting جنگو به صورت زیر الزامیست
+برای استفاده از درگاه بانک ملی و سامان تنظیم SECURE_REFERRER_POLICY در setting جنگو به صورت زیر الزامیست
 </p>
 
 ```python
diff --git a/azbankgateways/banks/sep.py b/azbankgateways/banks/sep.py
index 7b5d9fd..e09a9a1 100644
--- a/azbankgateways/banks/sep.py
+++ b/azbankgateways/banks/sep.py
@@ -16,6 +16,12 @@ class SEP(BaseBank):
 
     def __init__(self, **kwargs):
         super(SEP, self).__init__(**kwargs)
+        if not self._is_strict_origin_policy_enabled():
+            raise SettingDoesNotExist(
+                "SECURE_REFERRER_POLICY is not set to 'strict-origin-when-cross-origin' in django setting,"
+                " it's mandatory for Saman gateway"
+            )
+
         self.set_gateway_currency(CurrencyEnum.IRR)
         self._token_api_url = "https://sep.shaparak.ir/MobilePG/MobilePayment"
         self._payment_url = "https://sep.shaparak.ir/OnlinePG/OnlinePG"
@@ -80,15 +86,15 @@ def _get_gateway_payment_parameter(self):
     def prepare_verify_from_gateway(self):
         super(SEP, self).prepare_verify_from_gateway()
         request = self.get_request()
-        tracking_code = request.GET.get("ResNum", None)
-        token = request.GET.get("Token", None)
+        tracking_code = request.GET.get("ResNum")
+        token = request.GET.get("Token")
         self._set_tracking_code(tracking_code)
         self._set_bank_record()
-        ref_num = request.GET.get("RefNum", None)
+        ref_num = request.GET.get("RefNum")
         if request.GET.get("State", "NOK") == "OK" and ref_num:
             self._set_reference_number(ref_num)
             self._bank.reference_number = ref_num
-            extra_information = f"TRACENO={request.GET.get('TRACENO', None)}, RefNum={ref_num}, Token={token}"
+            extra_information = f"TRACENO={request.GET.get('TRACENO')}, RefNum={ref_num}, Token={token}"
             self._bank.extra_information = extra_information
             self._bank.save()