def customer_item_quantity_remaining(item_code = nil, code = nil)
      item = customer_item(item_code, code)
      item ? item[:quantityIncluded] - item[:quantity] : 0
    end
def customer_item_quantity_remaining(item_code = nil, code = nil)
      item = customer_item(item_code, code)
      item ? item[:quantityIncluded] - item[:quantity] : 0
    end
The amount remaining for a given item for a given customer.

item_code must be provided if the customer is on a plan with more than one item.

code must be provided if this response contains more than one customer.