SCG: 1.0.0 : NA #4 fixed issue

Author: kgchinthana

.env.example

@@ -1,18 +1,22 @@
 from collections import namedtuple
 from decimal import Decimal
 
+
 Order = namedtuple('Order', 'id, items')
 Item = namedtuple('Item', 'type, description, amount, quantity')
 
+
 MAX_ITEM_AMOUNT = 100000 # maximum price of item in the shop
 MAX_QUANTITY = 100 # maximum quantity of an item in the shop
 MIN_QUANTITY = 0 # minimum quantity of an item in the shop
 MAX_TOTAL = 1e6 # maximum total amount accepted for an order
 
+
 def validorder(order):
     payments = Decimal('0')
     expenses = Decimal('0')
 
+
     for item in order.items:
         if item.type == 'payment':
             # Sets a reasonable min & max value for the invoice amounts