Fix mixpanel event name

apps/payment/views.py

@@ -200,7 +200,7 @@ class PaymentwallCallbackView(View):
                 }
             product_payment_to_mixpanel.delay(
                 payment.user.id,
-                f'{school_payment.title()} payment',
+                f'{product_type_name.title()} payment',
                 now().strftime('%Y-%m-%dT%H:%M:%S'),
                 properties=properties,
             )