Fix payment logic for first 1-10 days in month

apps/payment/views.py

@@ -217,9 +217,9 @@ class PaymentwallCallbackView(View):
                             date_start = arrow.get(school_payment.date_end).shift(days=1).datetime
                             date_end = arrow.get(date_start).shift(months=1).datetime
                     else:
-                        date_start = self.add_months(sourcedate=now().replace(hour=0, minute=0, day=1), months=1)
-                        date__end = arrow.get(date_start).shift(months=1) - datetime.timedelta(minutes=1)
-                        date_end = date__end.datetime
+                        month = 0 if now().day >= 1 and now().day <= 10 else 1
+                        date_start = self.add_months(sourcedate=now().replace(hour=0, minute=0, day=1), months=month)
+                        date_end = arrow.get(date_start).shift(months=1) - datetime.timedelta(minutes=1).datetime
                     payment.date_start = date_start
                     payment.date_end = date_end
             if product_type_name == 'course':