Addition of check for amount

Author: kushthedude

app/api/orders.py

@@ -69,8 +69,12 @@ def is_payment_valid(order, mode):
 
 
 def check_billing_info(data, order):
-    if order.event.is_billing_info_mandatory and not (data.get('company') and data.get('address') and data.get('city') and
-                                               data.get('zipcode') and data.get('country')):
+	if data.get('amount') and data.get('amount') > 0 and order.event.is_billing_info_mandatory:
+        raise UnprocessableEntity({'pointer': '/data/attributes/is_billing_enabled'},
+                                  "Billing information is mandatory for paid orders for this event")
+
+    if order.event.is_billing_info_mandatory and not (data.get('company') and data.get('address') 
+                           and data.get('city') and data.get('zipcode') and data.get('country')):
         raise UnprocessableEntity({'pointer': '/data/attributes/is_billing_enabled'},
                                   "Billing information incomplete")