diff --git a/utils/pna.py b/utils/pna.py
index f0e2d78..e43d919 100644
--- a/utils/pna.py
+++ b/utils/pna.py
@@ -10,7 +10,7 @@ class PNAClient:
 
     corporation_pin = settings.PNA_CORPORATION_PIN
 
-    def request_normal_sale(self, amount, description, callback_url, order_id: int, phone_number):
+    def request_normal_sale(self, amount, description, callback_url, order_id: int, phone_number=None):
         data = {
             "CorporationPin": self.corporation_pin,
             "Amount": amount,